Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca5dc49ed30dc4…

MALICIOUS

PDF

78.5 KB Created: 2021-06-03 14:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48296a8503ba1128ec9e6f2e270421f9 SHA-1: 56cd66f06b9f0ed6ffb60388652c0fe3465f12de SHA-256: acca5dc49ed30dc43e2d4214919c0a681428c368e92425aff4c275569ffbdc8d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to 'smidgel.ru'. ClamAV also detected this as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/pbw?utm_term=linear+equation+practice+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4451551/normal_60b7cdb798ad0.pdf
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/ccb32f44320cbf.pdf
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/lojerorid-dasujikaf.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_605cdddae503a.pdf
    • https://static.s123-cdn-static-d.com/uploads/4445749/normal_60afe32a1c13d.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_6037a18fece68.pdf
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/5d4cf29e.pdf
    • https://sasasukaga.weebly.com/uploads/1/3/4/6/134624721/3233395.pdf
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6054791f2cbac.pdf
    • https://static.s123-cdn-static-d.com/uploads/4404310/normal_60b3e6669dbd4.pdf
    • https://rikadujijewebe.weebly.com/uploads/1/3/4/7/134726005/8512678.pdf
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/3653162.pdf
    • https://static.s123-cdn-static.com/uploads/4406514/normal_600224077ac1a.pdf
    • https://bisijonowazupu.weebly.com/uploads/1/3/2/6/132682684/1e3552d101d0.pdf
    • https://zutegikovepob.weebly.com/uploads/1/3/4/0/134017150/nufaroxaviwidet.pdf
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/6952321.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3d8565c0-42f5-4436-b701-c92b284fb977/76221272454.pdf
    • https://uploads.strikinglycdn.com/files/8de40f7a-f76b-4812-a768-eff94148633b/76215741627.pdf
    • https://uploads.strikinglycdn.com/files/c96ccf7e-a714-44d5-a45c-e50539d8d066/what_is_manual_on_a_pressure_cooker.pdf
    • https://uploads.strikinglycdn.com/files/90cd1ac2-e50d-41e5-a241-532c4e01d60f/descargar_libro_instrumentacion_industrial_creus.pdf
    • https://uploads.strikinglycdn.com/files/1dd17a2f-4efc-452f-912b-e13935b5692c/lds_seminary_teacher_manual.pdf
    • https://uploads.strikinglycdn.com/files/e27d62a2-739d-4e77-958a-62bc040d3ecb/75081619357.pdf
    • https://uploads.strikinglycdn.com/files/4738f3db-7049-4490-92b3-92221b7bee4f/the_emancipated_spectator.pdf
    • https://uploads.strikinglycdn.com/files/569a16b0-10aa-4538-b5fc-89961392d3df/contact_carl_sagan_quotes.pdf
    • https://uploads.strikinglycdn.com/files/6b598eec-f275-4827-a0c7-185034f5a9d5/83579800444.pdf
    • https://uploads.strikinglycdn.com/files/fbcf0543-3a06-4104-9d65-949fdf464b05/what_is_type_1_glass_ionomer_cement_used_for.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e704.bin
93648412a5b9dc443d21b8243a68e8b2ae9dfd55b5d8074398777a3840dd62d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 5096 bytes
font_01_sfnt_off0000f861.bin
53478310b2240c34dfb7345f0d74e255f2202724604411c99e88ec7e2a2758c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10944 bytes
font_02_sfnt_off00011dc8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 4324 bytes