Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3bd1c3e2968efe…

MALICIOUS

PDF

80.9 KB Created: 2020-12-25 05:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b6ccaa73c1f3ee3fd5d41b00f8123c86 SHA-1: 72b35d0a4f3f03133db780cda43f694a8e69fbe5 SHA-256: 5c3bd1c3e2968efec30e19670453c1de13a97ff5cc08b7eb2443a17e86423048
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=xfinity+disney+jr+hd PDF link annotation
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/68c400e3e6.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/dekefomivupe-kovak-talajonipa-fedebiraroz.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/3266086.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/ghfViai/exoplanets_discovered_by_tess.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/jgjgFhi/34869689552.pdfIn PDF document text
    • https://lolewifewo.weebly.com/uploads/1/3/4/7/134710585/426a10cd457.pdfIn PDF document text
    • https://cdn.sqhk.co/nibidawe/icFhcHd/wembley_games_euro_2020.pdfIn PDF document text
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/be59b69f8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/5JgiAih/282552697.pdfIn PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/d40f59e4.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/march_mammal_madness_2019_final_roar.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/56635203622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68c33b5-9006-4efb-b369-734479b3cb3a/pokemon_ascension_2_espaol_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/miludajitedisebir.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e9db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9DB 14328 bytes
SHA-256: 01ebcda6cb9199c6dc021beee68fc557d04ad1200efdbcf5958cf9cb6ed48ca3
font_00_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 4908 bytes
SHA-256: b973e43fecc8b4cb8ae180b2024b0854f2bc8643686eec580bf06b8ec490ba1b
font_02_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10964 bytes
SHA-256: 9a316f6fb716e05cbb8ed1ea8611e88080b643e13fcacd6ccd90f7a2a0fcea22

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