Malicious PDF — malware analysis report

Static analysis result for SHA-256 913e543c313fb417…

MALICIOUS

PDF

80.9 KB Created: 2021-04-26 09:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23c266942603422ee0db2e09599c7c74 SHA-1: 739d1c9e225e25ba7e26dcd5e63ed2c958199843 SHA-256: 913e543c313fb417d9b469fbf136d155ea4d8530c3931b6cc3b118efbb2992be
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including a critical finding for a PDF link farm. It contains numerous external links, with a primary suspicious URL being https://botokaw.ru/strik?utm_term=how+much+to+ship+fedex+international. The document body, though heavily obfuscated, suggests a lure related to shipping inquiries, aligning with phishing tactics. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially malicious sites.

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://botokaw.ru/strik?utm_term=how+much+to+ship+fedex+international PDF link annotation
    • http://tarezirok.mypressonline.com/44857785651.pdfIn PDF document text
    • https://bukiwajomudaf.weebly.com/uploads/1/3/4/4/134437050/retugir_kogorowi_nawuxanelo_fizelut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377095/normal_5fed949d800a4.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/63718454427.pdfIn PDF document text
    • http://sugoxebojun.getenjoyment.net/jivim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5ffb3a73e345e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5fc88c066366d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_60121b7d4897e.pdfIn PDF document text
    • http://zitosuganenat.medianewsonline.com/kupimugunenawoterunedonup.pdfIn PDF document text
    • https://basixafonamolod.weebly.com/uploads/1/3/1/0/131069750/ca9ca786777062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fca7ef96-81ba-489e-847f-d5e958ebbc19/how_to_estimate_construction_costs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a016a6-2ca1-4991-a290-92ebeb463626/how_to_install_graco_4ever_extend2fit_forward_facing.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/34656146405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0352a3a2-f913-4fe1-9709-91f288c6cc27/97409703517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088f2128-ccb5-47e3-9323-89d04b7ddbf7/ribefakaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56c55ec-cf5d-4f14-a2f4-d4589880cd17/tusavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec06a5a9-241f-4a87-b1ff-b3738ef1ce8b/55035782339.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/el_magisterio_de_la_iglesia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 5396 bytes
SHA-256: 7fcf31bb9a33d052f356f287e229cf8e5ec89882933797f7873d04267373ffb2
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 11092 bytes
SHA-256: 064dc641ac096d0862baf215e3d279c5537a468e8bb35d1711fd2e53612b405c
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333