Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc29af82d38587a…

MALICIOUS

PDF

77.4 KB Created: 2021-06-05 11:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f0a5e6756e683a273416d1654af95bc SHA-1: 50a3a7acd9392bb192e977ee5f55642dc8bb7191 SHA-256: 7dc29af82d38587af2b98e0178cd047b88ccc51d0dae1e75a57f3513cb45f92f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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 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://catamma.ru/pbw?utm_term=como+quitar+herramienta+perspectiva+illustrator
    • https://cdn-cms.f-static.net/uploads/4447107/normal_605c07d18ad2f.pdf
    • https://lasuresupaka.weebly.com/uploads/1/3/2/6/132683400/xafovawupasa-metekuzosup-megipimejewe-didonibojedaf.pdf
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/d5c5c50304.pdf
    • https://fexolemigelewi.weebly.com/uploads/1/3/4/2/134235379/xuniforiso.pdf
    • https://static.s123-cdn-static.com/uploads/4498801/normal_5ffc2ef08878c.pdf
    • https://kogatakuzomaw.weebly.com/uploads/1/3/4/4/134444425/waxuzijebino-zenepabuvo-videji-foset.pdf
    • https://suwagapijewes.weebly.com/uploads/1/3/2/6/132682436/fegexafo-nuvisiforok-mizizof.pdf
    • https://xujurewe.weebly.com/uploads/1/3/4/8/134865393/4f666d.pdf
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/62f43e5619c9e02.pdf
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/7785562.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mizunebapod.pbworks.com/f/how_to_tighten_a_bolt_in_a_tight_space.pdf
    • http://fepewuwakow.pbworks.com/f/44089911783.pdf
    • http://lodedeti.pbworks.com/f/50005037886.pdf
    • http://ludagobef.pbworks.com/f/zivil.pdf
    • http://muxopal.pbworks.com/w/file/fetch/144469563/10374751788.pdf
    • http://muxopal.pbworks.com/f/why_does_my_dyson_vacuum_not_hold_a_charge.pdf
    • http://najapenoz.pbworks.com/f/unidad_3_etapa_2-ws_3_answers.pdf
    • http://misabovu.pbworks.com/w/file/fetch/144547944/clocks_and_calendars_aptitude_questions.pdf
    • http://zolunegoli.pbworks.com/f/18961814277.pdf
    • http://xelivolofuso.pbworks.com/f/turowapunisafife.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144412041/kulaguwerirulamaxuxegu.pdf
    • http://jitijaloj.pbworks.com/f/how_much_royal_canin_puppy_food_do_i_feed_my_puppy.pdf
    • http://zezimin.pbworks.com/f/gw2_raptor_mount_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef77.bin
bd0e222e0401485682b046dbcb342a09192bc78a9f1ff630ef9d372604323565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 5264 bytes
font_01_sfnt_off00010136.bin
251eb75a02db44ab0f605f32e8f43b92693d7e5146df53607d2eb32117ee275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 11292 bytes

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