Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb513b3c416344f…

MALICIOUS

PDF

85.3 KB Created: 2021-04-07 10:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 731448cd0aec8bec850ddff69a7b86e2 SHA-1: e023eb3995e302d3b6a688b7522e3e6c4d558387 SHA-256: bbb513b3c416344f982fdc9361ccdfd6cfbc95997740dffe6d54f0547934e626
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used to create link farms for SEO poisoning or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=wonders+of+the+modern+world+pdf
    • http://lubevos.scienceontheweb.net/agriculture_in_ghana.pdf
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/321ef02.pdf
    • http://snegny.com/army_mdmp_manualnm2ru.pdf
    • https://static.s123-cdn-static.com/uploads/4391602/normal_5fdf6b7baee33.pdf
    • https://static.s123-cdn-static.com/uploads/4420013/normal_600068c83a755.pdf
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/5379800.pdf
    • http://sipipewawezizuf.getenjoyment.net/les_mis_abridged_audiobook.pdf
    • http://glossywp.online/jabalomupe24tj.pdf
    • http://buytoday.cc/how_long_is_a_1_12_scale_caresh5o.pdf
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/vomon_remudabe_tazizuk.pdf
    • http://instofficial.online/singer_401a_user_manualv6kpt.pdf
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/c2016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://riveminigokoxa.myartsonline.com/57387753681.pdf
    • https://s3.amazonaws.com/zeworibuzoza/pandora_s_box_arcade_manual.pdf
    • https://s3.amazonaws.com/vovuzize/39632616298.pdf
    • https://s3.amazonaws.com/muxozuvalubi/sixemamejuwiviwetakaz.pdf
    • https://s3.amazonaws.com/xulikamul/berkeley_oldstyle_black_font_free.pdf
    • http://jibimom.myartsonline.com/aging_oxidative_stress_and_dietary_antioxidants.pdf
    • http://limoxukuk.atwebpages.com/rekapilemijalokajonup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010239.bin
62073b2416f147e8106ac9bda405a83bf48ef016692bbf368ac19315519a0575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 4916 bytes
font_01_sfnt_off000112d5.bin
d857965546b2b5f8d8c71609f874df22b67af9d45fc67a57ae4ae58c2916b272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 12260 bytes
font_02_sfnt_off000139db.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 4324 bytes

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