Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1551be04a76db5f…

MALICIOUS

PDF

75.2 KB Created: 2021-01-11 18:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b326e3cdd131a8c25aff8f2c076b22f SHA-1: 6a5f3c98b2aba258f4796a8025dbe4a9dd93d7ff SHA-256: d1551be04a76db5f958bf2c2e84ce287c1d8577f4048e68700b8cad4ffb86d50
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://traffnew.ru/aws?utm_term=enfermedades+por+deficiencia+de+vitamina+c+pdf PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/dggfWii/sawixibe.pdfIn PDF document text
    • https://gifimaxenewurup.weebly.com/uploads/1/3/4/4/134458705/0ea6c2284d7c151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5fceef27af22c.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/kuximub_potagof_tobopedofowabos.pdfIn PDF document text
    • https://juvobivi.weebly.com/uploads/1/3/4/7/134756882/c6e00.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/jfjfkqv/sprinkle_island_2_apk.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/59b43e857af.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/8286b3e2e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/povodijirig/rolisepibovus.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/driving_manual_permit_test.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/date_format_rpgle.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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 5284 bytes
SHA-256: e6902eece72a223918bea4e1bf42f26a2533c54da61ac6deaa766a908d5f4091
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 11184 bytes
SHA-256: 43f9e15cd87f4268a058659bfa23582ed0e8b71509a69c68968c66cce7e14d4e

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