Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56ba81183a6f19d…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 16:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7fff1da6eff89e4f4cc9ec3ef71ee0 SHA-1: 7b37665e002027712d4431d7ca1388f383a54234 SHA-256: a56ba81183a6f19d42d2dcb37e1f7973b6f421dee5eba4b77f655e2e0d53eb5a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam content, aligning with spearphishing attachment tactics.

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-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://maypoin.ru/wix?keyword=orthographic+projection+worksheet+3
    • http://ing-jobs-opportunities.com/75572795487c6c89.pdf
    • https://cdn-cms.f-static.net/uploads/4447250/normal_60144b63ba45e.pdf
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/pakokilefixukiva.pdf
    • http://xuxijosut.sportsontheweb.net/mipalanazusamofiwedol.pdf
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fc6f18c0a18c.pdf
    • http://rasidafepu.mypressonline.com/nordictrack_1750_weight.pdf
    • http://toolsbestpricemicrometer.site/jbl_charge_3_instruction_manualgh9kl.pdf
    • http://arfesopt.com/homelite_chainsaw_manual_43120fkjvo.pdf
    • https://wuvonavozaf.weebly.com/uploads/1/3/2/6/132695620/vewogeletena.pdf
    • http://websecurer.tech/cuisinart_toaster_oven_will_not_turn_oniho44.pdf
    • http://gmetry.online/speed_queen_dryer_af_error6qtt0.pdf
    • https://dekilaroturiti.weebly.com/uploads/1/3/1/8/131856809/bajamolufova-putewuzexebiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1bced0b-25a4-4243-9295-28e0239c033e/what_is_management_by_exception_class_12.pdf
    • https://uploads.strikinglycdn.com/files/f8fcd02b-5838-4c39-a806-a76ade9a31b9/dr_llaila_afrika_wiki.pdf
    • https://uploads.strikinglycdn.com/files/010c95ba-16c2-41b8-b504-2095cb365404/rodiwafirofavaseg.pdf
    • https://uploads.strikinglycdn.com/files/4be7ef0f-8877-4f0b-bf45-749a7f2fa22d/zipunitixamijekor.pdf
    • https://uploads.strikinglycdn.com/files/240c05b1-8ca0-475a-a026-176325072831/what_are_some_math_key_words.pdf
    • https://uploads.strikinglycdn.com/files/1a2938f1-1289-46e6-8bfe-5b14675b25b7/is_blender_difficult_to_learn.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_off0000ec21.bin
aa6b6fe9c7edafd843b08576f2c4b456a90a1d2dba98e2c80f917edf205e2a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 5584 bytes
font_01_sfnt_off0000ff31.bin
89717b181bc7f8ce8a99c6e0e07f105f93cc2fab4db71d5575c662021e854aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11428 bytes

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