Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd3b11abeaf3873…

MALICIOUS

PDF

68.0 KB Created: 2020-11-13 07:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6f5f6e549f748d7d243ac686f742f468 SHA-1: 72a7a8f72de0bca20fc28783f59ba5f6c5802ef0 SHA-256: 5bd3b11abeaf38735d6361820bb197f08a8f565fcb5167f60480bfbd740eaf26
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to disposable hosting services, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://trafficel.ru/aws?utm_term=trinity+christian+reformed+church+lethbridge PDF link annotation
    • https://zemaxuwoti.weebly.com/uploads/1/3/4/6/134694437/peridugakejo.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/wiwubop.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/vulefebuz.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/pukikazafap-tetokopow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f894b196b53b.pdfIn PDF document text
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/jilapofofezalarotad.pdfIn PDF document text
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/mabovafezuwotu_bofezurik_vifed.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/xuditix.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/930e112274690a.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/xexiraxu_jazamotixova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ddd5ba-528e-4ada-bdd3-405c1b80abf6/deforiwipulibawaju.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/separation_anxiety_test.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/unblocked_age_of_war.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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 5628 bytes
SHA-256: 03a96692ea867f141359f6315d58f58341f5c4c36773a4d60343b5c504176d60
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 11496 bytes
SHA-256: 0dda1e4fd2024964930eda4cccf9db74457cb6037cd5bf7dacdd9aa495ee82e5

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