Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9eeff92d74eb61…

MALICIOUS

PDF

77.6 KB Created: 2021-04-06 19:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ebb9fab044e34c7195f9ca1cbc89f93d SHA-1: b19db453e0b7359cebde313f8debade251cec78a SHA-256: cd9eeff92d74eb61c5fbdd8fc1e85a4441a079ae32888701f1397471582e5069
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=disable+microsoft+visual+basic+for+applications PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/6ghgiid/rusefuxazef.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Q2jagim/83387746722.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/how_to_start_fisher_and_paykel_dishdrawer.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jhjchhg/58992977765.pdfIn PDF document text
    • https://vukumurumijolot.weebly.com/uploads/1/3/4/4/134433046/554377.pdfIn PDF document text
    • https://lugejalafomap.weebly.com/uploads/1/3/4/8/134884490/vebobiborefo-fimumewor-gokefo.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/biological_clock_in_fish.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/2gfheL6/glass_chess_set_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/Wo6hfCU/french_nails_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/pijcjct/online_bubble_shooter_games_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajawawuriz.epizy.com/jajufitatokeruxudujefebuk.pdfIn PDF document text
    • http://vegunag.rf.gd/wegibigunes.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/pufaxajevav.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/kiss_the_rain_flute_sheet_music.pdfIn PDF document text
    • http://sabenimuzu.rf.gd/tixidukipatal.pdfIn PDF document text
    • http://sezusin.rf.gd/84323683711.pdfIn PDF document text
    • http://ridejisedogik.rf.gd/48011206043.pdfIn PDF document text
    • http://mejumobax.atwebpages.com/lafuserano.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 5360 bytes
SHA-256: c46a74ab5d1d5aa017c2cd8b3a2a2896d69a7e23bcece3511616ec93acdd029f
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 10860 bytes
SHA-256: 471b9cf3090549c40a082b3e72db76291e7d03fb19ab3b939338d615d9d3f56e

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