Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ba0724253284da…

MALICIOUS

PDF

79.0 KB Created: 2021-06-10 09:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e4220d8311b00671b855b0f0c41ac831 SHA-1: 04644f1d54748a4033a14c177362d2c4e5178432 SHA-256: 91ba0724253284da914ae4c452c9beeb002df045d9051dce4c53b992e301ba6f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://huntic.ru/pbw?utm_term=bishop+and+nabney+2008 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd670c6d78b5.pdfIn PDF document text
    • https://bogevojozoluki.weebly.com/uploads/1/3/4/7/134708627/debimuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_6034854e05f16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5ff654b281863.pdfIn PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/3149475.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476429/normal_60b4894a7ae0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotuwufo.pbworks.com/w/file/fetch/144877005/the_house_on_mango_street_journal_guide_answer_key.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/58513270526.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144505782/63813168129.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/total_body_workout_gym_equipment.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/cold_war_reading_guide_answers.pdfIn PDF document text
    • http://pewexojazo.pbworks.com/f/zutugag.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/f/44983758376.pdfIn PDF document text
    • http://ravaxes.pbworks.com/w/file/fetch/144793878/how_to_use_a_xikar_travel_humidor.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/pokemon_gba_games_on_switch.pdfIn PDF document text
    • http://jamexapageku.pbworks.com/w/file/fetch/145019544/karojipede.pdfIn PDF document text
    • http://nekimijazom.pbworks.com/w/file/fetch/144801279/vibopalomixate.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144683856/crows_zero_2_full_movie_in_hindi_hd.pdfIn PDF document text
    • http://lipemuv.pbworks.com/w/file/fetch/144876372/onlyfans_free_premium_apk.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 5680 bytes
SHA-256: c365750c225bf4511b5b814e8b0eb170592f4397de289103dda523aae596d634
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 11636 bytes
SHA-256: 01127fc3d6dcd660c6d3f53c643e4cfdead04a10577e500c9fedc890a5167f35
font_02_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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