Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8f433ff4be83bb…

MALICIOUS

PDF

64.4 KB Created: 2020-11-24 06:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fc76396d942e6167829f967aa1cd8fde SHA-1: bde44b729de454d5a83599fb7734ffcbb428cfa0 SHA-256: cc8f433ff4be83bbea9e0d0052ae22021a6a2211f39baf0ba13c3650350cc0b2
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 a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to leverage external resources for malicious purposes.

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/strik?utm_term=alabama+driver+manual+audio PDF link annotation
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/wejirubosodadafesok.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/2be763f8e0ad5c.pdfIn PDF document text
    • https://manajizi.weebly.com/uploads/1/3/4/9/134902852/zoloxoderimufom_miwafapo_bezituxesa.pdfIn PDF document text
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/befodaxedatik.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/jasulisudula.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/fizuje-tadonotebogewig.pdfIn PDF document text
    • https://sipekenatevare.weebly.com/uploads/1/3/4/7/134776107/a58c92.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/tixopemawogukus.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/kamigovitakiril/geometry_dash_lite_apk_mirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a4442d-0f3c-49cd-aa2e-f173f39bcc8e/99216793324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42b7b20-2fbd-40a9-9db2-247f51f02b0b/lokefiwagudanetunatowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a42d610-a523-4d6d-af1b-b382c8d8e6b7/70225663581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cc2680-2ccd-4c4d-9d1a-be0f4a4f5c89/gezoxetudaderave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c3c89e-14bc-4830-b9ec-4d39887b6cc0/pajenefofipuluzum.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_off0000c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC060 4980 bytes
SHA-256: 288d9fb2b60ded9a889ddc7968a8c132e8f3ac9f24a8799e5a778f12dab1b457
font_01_sfnt_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 10536 bytes
SHA-256: 44a9b1c3c90e224759b4f3b3af095d750aefd2543860e9082c186ad120874b0b

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