Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9a1c2127875b8d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-18 14:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3de51b2ef64d83e08322b22820fff0f3 SHA-1: 9df3f5bb6925832f816db1619ea5cf29729d97dd SHA-256: ef9a1c2127875b8d80e774220164e5350f1a0fbd03381762a240692c2b40fb57
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=my+time+at+portia+best+recipes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488346/normal_6010d450e744a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6018d600883a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_60261f75458fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_601bc670a91fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_6026d04637134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ff48fc73a6e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5fc5a4e68b6e6.pdfIn PDF document text
    • https://bepifesak.weebly.com/uploads/1/3/4/0/134096259/9b071c0794061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5ffcf9323c281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fd243240f2c9.pdfIn PDF document text
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/vakuviwaver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ffaaf4d87ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6010c1cc4a778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff29190392bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_6017af3e2e6fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punegejofuj.epizy.com/57167585561.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/32902484941.pdfIn PDF document text
    • http://ripilunuw.rf.gd/south_america_map_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/riven_guide_destiny.pdfIn PDF document text
    • http://sepimenixinu.epizy.com/upload_gif_to_instagram_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/38431741579.pdfIn PDF document text
    • http://sexujojo.epizy.com/compound_subject_and_predicate_worksheet_4th_grade.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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 5296 bytes
SHA-256: 90842f8461575ff8900eaa0963957b1018a0c586176e3f695d19a4f20318281d
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 10260 bytes
SHA-256: 94165347d286090acf3a183acd8e8f050833042c168f22f803e1ee5a77ec8453

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