Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f508343fa0f54a…

MALICIOUS

PDF

62.7 KB Created: 2020-12-03 18:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: aafac34be213f7f577ba48a239df89cc SHA-1: ece8b96b4944169481d813a2c1cec99f89c97e68 SHA-256: f3f508343fa0f54ace430dcc34cd965b47f923c5e38de9bf6c2ef65ad31fb126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm structure suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=pioneer+mvh-p8200bt+manual PDF link annotation
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/dozelojukazeni.pdfIn PDF document text
    • https://gunomelovolif.weebly.com/uploads/1/3/4/7/134735852/f263eaf83fc.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/xazarujokemus/59260871582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fa8bc5-169e-4b72-9f12-99cde981d266/pictures_for_teachers_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0dd43f5-ea33-4019-93e7-f39ef0727077/powavurabipusadegawopaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7deebe41-4038-424d-beaa-43d26cc8d28a/kenojogavifares.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54070c14dfd36fe0e2b11/t/5fc7baf64f9413233b2c5336/1606925047241/skylands_urgent_care_llc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7e9b32-d7bb-4f1c-8366-46a0be678078/nclex_rn_made_incredibly_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/kulenelawoxulipanipoworu.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/sneaky_pete_season_3_episode_4_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/85223376324.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/manufacturer_s_incident_report_rev_8.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_off0000b70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 5584 bytes
SHA-256: 593f5f60f5c6eb0e87d41811a7ff19999ad78189b6a2ae337771b3d70dbfa5c5
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 11180 bytes
SHA-256: f73d2b9740233f7a9ed2402dcfaefe59322224d6ddb2bbe49341b29b075a664d

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