Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb2dca8ab2a743d…

MALICIOUS

PDF

72.9 KB Created: 2021-02-14 15:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fa11503feb3d929eae0f7125789516ac SHA-1: fae6f64327539e81842226c9922efb7d67b55d43 SHA-256: cfb2dca8ab2a743d40d86d8ef3125073cb58a53d34853512735f8362292ca81f
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/123?utm_term=berserk+volume+19 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5fffe3a71124b.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/2404621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_602224498830a.pdfIn PDF document text
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/sijib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fe5d18728502.pdfIn PDF document text
    • http://ig-supportcenter.xyz/baby_boy_cute_photos76rcd.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/dacb43509ee6e7.pdfIn PDF document text
    • http://lnstagram-helping.live/juxasujadaezfr.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/gcgiogJ/7016543353.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/xulenefupuvixuba.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/wumarelig.pdfIn PDF document text
    • https://cdn.sqhk.co/dowotovewi/esTQ1jd/dafobuwomiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 3616 bytes
SHA-256: 2181e1bb6619b81ddeeff5309037c03debbe3b0a00863c5d2dd0898c06663e0b
font_01_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5004 bytes
SHA-256: 5a19e98d6350c9a1ba6239179e51b0334b81954546b370e9b576ca60c74333f7
font_02_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10676 bytes
SHA-256: 6863c5d8f66b1ac871901508190eea93cd862e56528bbf881a6aa1c32b735032

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