Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d13824dfcffb5bc…

MALICIOUS

PDF

84.1 KB Created: 2021-05-14 09:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e52fea048d24f886b5e90658ce2f093 SHA-1: cada3935d778b7056b71fbd3e193f5baaeab5688 SHA-256: 8d13824dfcffb5bce40e811c9f3bfcca50d46c8599497b4a9a3f2fab71175df9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The embedded content, though garbled, suggests a lure related to business acquisitions. The presence of multiple external links indicates an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=things+to+consider+when+taking+over+a+company PDF link annotation
    • https://cdn.sqhk.co/lezebulodiw/jjbhjhg/business_tips_from_successful_businessman.pdfIn PDF document text
    • http://grusha.space/closing_instructions_templatem7jbk.pdfIn PDF document text
    • http://cucoupon.info/38368810989h57h9.pdfIn PDF document text
    • http://pop-marketplace.ru/sotanotipopif3orx.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/ecG3Ht7/monkey_go_happy_6_level_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_29713845bf0845ceb992956d24aabd9b.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_aeb827254d314bd8bc820fe9f74872d6.pdf?index=trueIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_ea942b5aeebe47dd955268571aca1c68.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_2defbc150e6f49c58d732390ac09321b.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_09ffb56895234a02897fc2d1e6b3438f.pdf?index=trueIn PDF document text
    • https://ad5375d1-0dc8-447d-a54b-f1659eeba1ba.filesusr.com/ugd/a4ba79_055e3a3ffdf945f48cbe8e63f58b683e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/fibbage_2_all_answers.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_47d05539b7924d1c94094f341d1036c4.pdf?index=trueIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_55adf83a84014f6f9f30cf8a7c704f20.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_19d659162f634d87bbe23bdf475015b6.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_5a5efbe01f76498190c3e21e3ceb157e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/why_i_am_not_a_hindu_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 5508 bytes
SHA-256: 526aaf1f5672b34f5cbaeb099f856887893963a8757c7940ce29291fcaae6c78
font_01_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 10548 bytes
SHA-256: 0491e097b7ad2a7f20639de655b7fcb67cb3947f291da21f94b75e545e0575f0
font_02_sfnt_off00013478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176