Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6dcb172cf9cf29…

MALICIOUS

PDF

80.8 KB Created: 2021-04-14 12:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e099e2a6e78e869bc27abc9f672ddf2b SHA-1: 088af3f910d6ea2041615bea840ea432742fd987 SHA-256: cb6dcb172cf9cf29fc58bde9e3ef475dcc0708eb295eae105e46ca99657a3ed7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' structure pointing to 30 external PDF files. This suggests the document is likely a lure to redirect users to potentially malicious websites for phishing or further payload delivery. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://midufefew.ru/strik?utm_term=pathfinder+monster+manual+pdf PDF link annotation
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/942550.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/mswYjia/6095126663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_602ee6ea73f21.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/gcOgigW/bet_subscription_service.pdfIn PDF document text
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/kalik.pdfIn PDF document text
    • http://tikovg.xyz/food_chain_ppt_templatecw5ld.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/XLIowhj/wolf_live_audio_shows_group_chat.pdfIn PDF document text
    • http://instapriz365.site/disable_realtek_hd_audio_manager_startup9ve82.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/1010247.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/g9mi4if/smart_boot_manager_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451376/normal_5ffa1c0571767.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/05b1b1bb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_5fd19d7840ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fd82a5b1f816.pdfIn PDF document text
    • https://damemebu.weebly.com/uploads/1/3/5/3/135316778/b7f331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/tafolirolurivosem.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/aafp_pneumonia_vaccine_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/peruwopabe.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_d24f1aee02d2418697659e371c8e3bff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/68653618800.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_20916258670540338745e31b9d595254.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/macmillan_english_worksheets_for_grade_3.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://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 5280 bytes
SHA-256: 37e3d45b19a82885e2a91c11ddf7e87ca02fe50dec8780b83edce10ca51dc886
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 11640 bytes
SHA-256: aeb6869f6b48ba8059d4fe2468c6d76d97225958bde80206e6c80f308b25e318

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