Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1364f200dffc31b…

MALICIOUS

PDF

72.1 KB Created: 2021-02-20 23:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c290f033800e57cada852c697224848b SHA-1: 4aba51191dbada8e640a87e03170ccdda145c0d1 SHA-256: a1364f200dffc31bacaf2c0119cf38585fc314f4b00f957d8a6d0aaafdcb7d68
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a significant portion of which point to disposable hosting services and are part of a link farm. This behavior is indicative of SEO manipulation or a phishing lure, aiming to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/wix?keyword=islamic+dream+dictionary+in+urdu PDF link annotation
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/fomasamexerukofodab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_5fe9d2c150f94.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/1252469.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/lekafokalas.pdfIn PDF document text
    • http://vilopeg.xyz/cake_mania_apk_full_versionf8xf7.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/buvikakudusaz.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/2122958.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/resisuna/wiselipinevanabufodez.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/nudituwovufazirolexoxor.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/22700412817.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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 5124 bytes
SHA-256: 86827e6398c416b38b7d4cfd1155c08bda3d9eb157e7346cbcb67448fcbe940f
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 9952 bytes
SHA-256: 8565470ac1831f8dc93adaaf294334b6f119b3106d564a04dc0bdeb820c79d00

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