Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c1d942519fd950…

MALICIOUS

PDF

74.5 KB Created: 2021-05-31 00:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 75db60fa1a87a613acadfb1ed8af319d SHA-1: d7ea768a3409e739ab1a3e7d9375e23eb4a9f785 SHA-256: e3c1d942519fd9503248178ab361c9d3361b59123fe20c805d2c9590fb169c62
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=5+most+common+korean+last+names PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462350/normal_604e8086ebe81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_605a501119067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5fd8512c77218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_60553754a1c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_606bc014d5483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_600bfe06c8160.pdfIn PDF document text
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/posuneduxejuvupatoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fffb27cb846c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_604988c3e62b6.pdfIn PDF document text
    • https://pafekirikigu.weebly.com/uploads/1/3/4/5/134590200/korezoza-gisofe-gilarizi.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/ddba9ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5ffc3961d93fe.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/3192231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_60245583af30f.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/848521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5fedd11da62ea.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404112/normal_60b3ff7f4fd29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6ef5dc-d8c8-41b2-bac7-26f67ccfa601/blackjack_pizza_loveland_coupons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e152e9-e4d5-4b86-90b7-2d1b9394e106/javonodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad87b5f-ec77-4a05-aca7-55b5c715dc85/suxakajutulokozus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31dc27cd-016d-456b-ab6d-6ee5d7cb0cac/kitidorup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c7e02-a9d8-41da-ad81-98c94040516b/16440892100.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_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 5036 bytes
SHA-256: 572ae22d8673ce5aeb3d7bcf2a3332780b54b86c6c4a5d5ed3c6ab0beb259d02
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10716 bytes
SHA-256: 6c841a4e56c52bdeb201e0d3f8c2e17ffc82c70efa42eab2d542fb2afdcda93c