Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcef86d7f30d9e8…

MALICIOUS

PDF

80.6 KB Created: 2021-06-13 18:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 657b923535188e339484781a76c0c5f3 SHA-1: 4101dd8f381010b5779513bfb0cb5554123618bc SHA-256: 2fcef86d7f30d9e8af0e923fa7faa69a04a251d864f90fe2dd8eb9886178d62c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful websites.

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://laborke.ru/pbw?utm_term=movie+jabariya+jodi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601a10797e43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_602578087257a.pdfIn PDF document text
    • https://tixilumudesowor.weebly.com/uploads/1/3/6/0/136095614/1149302.pdfIn PDF document text
    • https://lelugawe.weebly.com/uploads/1/3/4/5/134590829/2addf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497658/normal_6008781ff3b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_604daeba187c8.pdfIn PDF document text
    • https://gesaleku.weebly.com/uploads/1/3/4/6/134694927/9397061.pdfIn PDF document text
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/4896222.pdfIn PDF document text
    • https://fegopamaxu.weebly.com/uploads/1/3/4/8/134896151/nizuxepow.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/gezod.pdfIn PDF document text
    • https://jifabipesetumef.weebly.com/uploads/1/3/4/8/134896168/3932737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/44df9e3c-03d5-4256-85e7-7684078ac646/43507705376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57652f3-c201-4fbc-a917-c8744cb98810/98887205120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cbd777-8ff7-4967-9701-ccfd2d4f2866/telenovela_corazon_salvaje_capitulo_53_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621f18d4-df50-4032-918b-923cc449b622/chiltons_repair_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14bfadd-7aea-49da-889e-3176ea4334a6/wetokuvuxalufiwidulajima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f661d4b-797a-45c9-9413-127274098f81/18739833495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799b7500-f6b2-4dba-a12f-4f28e006703d/siril.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 4992 bytes
SHA-256: 6e14c9825e2c832feaa375544e682429b85586c36d528ced7439e2be42205a68
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10828 bytes
SHA-256: 963fcfec1ac6dda84884a8a1e296b85a813c1b38417fd4d2471af46f04bd82a0
font_03_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 3364 bytes
SHA-256: 325365a6ad25e24944856f7799670f800814b89b1db4e5afefd8ad57a8b0f03f