Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fc9924c387ac6b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 10:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37eb7380e75d3dc5cd98f3e7309cee18 SHA-1: cee2be17aedc06b8d6bbcf002b648843b4b220cc SHA-256: 37fc9924c387ac6b9a2c9b3341a54d597826e3d103bd9286659713499bf8f47c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one specifically pointing to a URL that appears to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=lg+washing+machine+7kg+front+loader+manual
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/cac6ad.pdf
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5ff7792536728.pdf
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/nodobevib.pdf
    • https://luzijegeze.weebly.com/uploads/1/3/4/0/134040843/totewadimuperaxexuwi.pdf
    • https://cdn-cms.f-static.net/uploads/4378161/normal_605571e300db2.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_6055263f5330d.pdf
    • https://cdn-cms.f-static.net/uploads/4460446/normal_600d4fdec8fed.pdf
    • https://cdn-cms.f-static.net/uploads/4370989/normal_603c2a3ca7845.pdf
    • https://cdn-cms.f-static.net/uploads/4447647/normal_60414e3480bca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lekelepowo/four_figure_grid_references_worksheet_with_answers.pdf
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_e36b446103964f5baf78c5a20911ec25.pdf?index=true
    • https://s3.amazonaws.com/xomudufe/why_does_my_whirlpool_washer_leak_water.pdf
    • https://s3.amazonaws.com/libowebujakux/nursery_games_free_for_pc.pdf
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_01cbe772e64b4361b4bd07860cd4b235.pdf?index=true
    • https://s3.amazonaws.com/xupizewuxere/python_list_comprehension_multiply_two_lists.pdf
    • https://uploads.strikinglycdn.com/files/62be7f32-16f7-4f3f-93e6-96a19713ca46/jumifime.pdf
    • https://uploads.strikinglycdn.com/files/e5cde2b6-254b-4ac2-8cfa-b3b62124c033/powerflex_525_program_with_usb.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_414dd3be9a5f42c68b522d40d40b5039.pdf?index=true
    • https://s3.amazonaws.com/jiwisigetizoxif/72632263367.pdf
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_a7ead52f68e341f28972205c6b84e854.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ff140e6-bf76-4356-9ea4-3b856254c3ae/jigeniwavenulabiv.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_off0000f072.bin
fa9805ed10fca9f8ba7f1737851523020df79162e63d74870b375303dc8d834f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 5612 bytes
font_01_sfnt_off0001037f.bin
a57f851e23c61b69dd900370706f3589d360c730ef0e2f8fde587e71d89aed76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11584 bytes

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