Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f04804dcc6e96b…

MALICIOUS

PDF

81.9 KB Created: 2021-03-10 05:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1b205d8746d5d0cb43c26801bdb0f827 SHA-1: 204fbc37a289171047b5c731b97806ce56e883ad SHA-256: e9f04804dcc6e96be604f49abf3fceae8c3891da286e20931d24cb50ad0f4725
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=add+text+to+multiple+pdf+files PDF link annotation
    • http://bagajuz.iblogger.org/avengers_theme_sheet_music_trombone.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/lezedapibur.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/jelonok.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/UHjb9hc/bomb_hunters_mod_apk_rexdl.pdfIn PDF document text
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/8d31e679f7b.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/fkLhghj/uganda_knuckles_know_da_wae.pdfIn PDF document text
    • https://cdn.sqhk.co/sirezozere/1ar8Az3/i_will_think_inside_the_box_meaning.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/4_pics_mystery_2_level_9.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/gfKGhg7/celestial_seasonings_bengal_spice_tea_amazon.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/6079097.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/a8f9413c66ccc11.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/47368203792.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/66126975750.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/susofiv-wasazek-ribar.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/c664f1fe0a613f.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/hdjdXie/ball_sort_puzzle_level_1299.pdfIn 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
    • http://guwavamo.rf.gd/mumegevujojo.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/wovuwajoroberi.pdfIn PDF document text
    • http://femagela.myartsonline.com/7619647692.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/is_real_estate_a_good_investment_in_2020_in_india.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 4712 bytes
SHA-256: e68f5f78b343d3dadd16b133071858e2b6ac3182c805ee1e83b077be0a8c0dcb
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 15000 bytes
SHA-256: 2a24bad9912cf074bb81da33f9a154b3d300a0676b5bae195de826576cbf5dc0
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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