Malicious PDF — malware analysis report

Static analysis result for SHA-256 de372ea895e3c01d…

MALICIOUS

PDF

76.6 KB Created: 2021-04-16 12:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06e5deaffd40af5caee7a0334577e46c SHA-1: 58b657d5d48a09e854239afbdd4a615f39b5eee5 SHA-256: de372ea895e3c01d8415b73a3c6baac529e3e6fa7464945032fc765fd7133277
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 pointing to seemingly unrelated PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=who+makes+amana+front+load+washers
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/2012270.pdf
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdf
    • http://gemofesane.medianewsonline.com/58740896231.pdf
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/4342128.pdf
    • http://mizebojusur.mypressonline.com/narojanutigemexiduso.pdf
    • http://wurikiwerofa.getenjoyment.net/byosen_scanning.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/1752261.pdf
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/dirufeforosux-rilinamosifuli.pdf
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/falalizufat_digonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f264b12d-9166-43db-b0c9-1e0b37c61945/how_to_fix_vape_battery_that_wont_charge.pdf
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_dbf0eea4ef4d4334bfd1414b0be057c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5a30cab-0c6a-4689-ab67-92592712e3c1/murray_lawn_tractor_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/6a52c354-034c-4e8f-934e-9164e2364aea/chamberlain_whisper_drive_remote_41a6127-1.pdf
    • http://bepolujogox.atwebpages.com/call_me_by_your_name_2.pdf
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_50e21aabe44e4d02a81f3746c598e9aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0736cb3e-3e69-48de-a250-27aaefa75e25/tubolanenexetofo.pdf
    • https://uploads.strikinglycdn.com/files/418fe72e-71c7-4895-b441-242f923bf97c/food_matters_holly_bauer_free.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_off0000ef1b.bin
5cb7228c6df7d314eb397db2c6d804e02ad75381f000cd562692ac0c7d6cadcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5316 bytes
font_01_sfnt_off00010117.bin
cc0f1cbcb4696b32912d2fe649143f851d379aa2ea6fbb1c0cee35935ae07c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10628 bytes

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