Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c0b151a775b625…

MALICIOUS

PDF

97.2 KB Created: 2021-03-18 04:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad561b83ae9d4cc0988f53a77530ed72 SHA-1: e0441774facff67f9aa8185d9bd94c5548d5da54 SHA-256: 85c0b151a775b625fe299c1c8f72824ff098a8637a5447fae756eccd41637b8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a potential link farm for SEO manipulation or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=soil+bulk+density+calculation+pdf
    • https://cdn-cms.f-static.net/uploads/4389599/normal_6017992d43570.pdf
    • http://form-copyrightservices.com/doxusixanabutosimazijuvaguska.pdf
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/jasipobozox.pdf
    • http://afracheat8.xyz/zuwoxebatasajefinxxgs.pdf
    • https://cdn-cms.f-static.net/uploads/4491432/normal_604d69fc30081.pdf
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fdcce6877f85.pdf
    • http://fajamad.mypressonline.com/barerijukof.pdf
    • http://kokulotasuz.mygamesonline.org/the_american_journey_early_years_chapter_10.pdf
    • https://guxisawupejova.weebly.com/uploads/1/3/0/8/130814058/6ea864a0650.pdf
    • http://ru-1.casa/wofupogokejagilexej.pdf
    • http://endi-itali.space/journeys_out_of_the_body_hemi_sync_download0dwcy.pdf
    • http://mihetos.xyz/p90x_workout_back_and_biceps2mp0b.pdf
    • http://pedaxofanor.mywebcommunity.org/sigavapukujoduderevogosa.pdf
    • http://anarchymedya.com/precios_para_el_circo_de_la_chola_chabucaql5jf.pdf
    • http://rivozuzeno.mywebcommunity.org/72611267169.pdf
    • https://cdn-cms.f-static.net/uploads/4447467/normal_6026a49a985d2.pdf
    • http://tezibif.mygamesonline.org/makalah_bilangan_rasional_dan_irasional.pdf
    • http://moshon.space/70034360850esb9b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_abfd0d46161944c4981b7e5acb689ef0.pdf?index=true
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_fc0a2c7d1b9f44ceba16047a5de416e3.pdf?index=true
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_cdef70ae0e7d4175a7ac53b4d9fc63f2.pdf?index=true
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_43b65d8164dd4d67af2f67988d1a9171.pdf?index=true
    • 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_off00013a84.bin
a460f6098eb7448285ee5203f2a46f71fea2899ed9837c65018a834dc573e89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 5464 bytes
font_01_sfnt_off00014d35.bin
56636ab2c3e8015d4af8f658e09af424519c6d836da7e10617fe35f91e3996fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D35 12540 bytes

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