Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb1d4ff3637c170…

MALICIOUS

PDF

110.6 KB Created: 2021-03-26 07:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3cade3ab80cc8d756776505114ace4c6 SHA-1: a4d26eac048def74c492bae4f65c9c254ad26841 SHA-256: 1eb1d4ff3637c1709215643516fcfbf8c5324dd11031f4eea28b7c62534b6cd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this assessment. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lead users to harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=malayala+manorama+e+weekly+pdf PDF link annotation
    • https://cdn.sqhk.co/rapovebakeb/h1sKPsV/carmel_by_the_sea_restaurants_open.pdfIn PDF document text
    • https://cdn.sqhk.co/fedijadika/Vhagijf/40033784777.pdfIn PDF document text
    • https://miwefotuwid.weebly.com/uploads/1/3/0/9/130969826/bogalogowof.pdfIn PDF document text
    • http://lasleymarkt.ru/retezuvapalejusedonoxinibfj.pdfIn PDF document text
    • http://ndfnasg.xyz/jamajukrmsuq.pdfIn PDF document text
    • http://catsism.com/profit_over_peopleafczu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/iibxTvO/dojitu.pdfIn PDF document text
    • https://cdn.sqhk.co/medipevagopu/nhfjjcO/kabekavidajogajuworumof.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/Xjfxlhi/pokerstars_play_free_texas_holdem_poker_game.pdfIn PDF document text
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/07565bcc9deef4.pdfIn PDF document text
    • http://boevoenlp.com/wenudodegaxesavarelefotoosja6.pdfIn PDF document text
    • https://kewenarizifosiz.weebly.com/uploads/1/3/6/0/136092989/marogit.pdfIn PDF document text
    • https://vufodasab.weebly.com/uploads/1/3/4/6/134639116/4455384.pdfIn PDF document text
    • http://uaregroup.com/legotdeik8.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/HiSLheY/34620722255.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/93e92f9de98f23f.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/jgfHJjd/minecraft_cracked_1._13._1.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/a00bigz/best_fantasy_flight_board_games.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_c51b71a9261044d181655af4ad312905.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_d2ecfe9bbe054d2db0e4368583f4e789.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_f015992b068c4d34a71c5f3c4bfa2408.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_665ceefa467644a397dacbb06de0064b.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_d90ff0dc404e4f23bbfd94b168316109.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011131.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11131 27472 bytes
SHA-256: ba1ca4a303aea28c96044f9248d7f53c822cf9a5564f908dee750f6b500f0de7
font_00_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 4932 bytes
SHA-256: 057767aafa2f73b73afd88a91df62e0daf276ea306bdf19e13375a90e83f30c8
font_02_sfnt_off00015f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1B 12312 bytes
SHA-256: cbda0983d6507cabc32691c02035ce9d4cd4d288f662a91b3a89da8df4af38a5
font_03_sfnt_off0001887b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887B 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_04_sfnt_off00019dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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