Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338eac8c849aa65…

MALICIOUS

PDF

86.4 KB Created: 2021-04-21 21:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7884ee968e3abb3f1cad1080c23922bd SHA-1: 5700b4d70385f166db01fb0a51357c3cc66ce693 SHA-256: d338eac8c849aa65cf4fcb60de0a1888d04ad1774e02dfc3930f6700ac57833f
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a URL that appears to be part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The presence of numerous external links, some on disposable hosting, suggests a tactic to distribute traffic or host malicious payloads across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=reasons+why+indirect+rule+was+adopted+in+british+west+africa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374951/normal_600ce2f303436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_60503f34ed0eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5fcdbbe0480df.pdfIn PDF document text
    • http://stonersfranchise.com/creative_writing_prompts_for_high_school8udnz.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/jilulom-suxofufone-lidufakupape-notir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_604b4dffab390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_6017dd4408bc3.pdfIn PDF document text
    • http://bigno.space/wekimekasu2lfy3.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/7580d5b0c3.pdfIn PDF document text
    • http://blognews.top/48664606311d0rgv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fda26774a7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6037d5e82456f.pdfIn PDF document text
    • https://jeketivogusu.weebly.com/uploads/1/3/1/3/131398097/226863.pdfIn PDF document text
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/vememivepase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_60072c4a15fe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403681/normal_5fc8434a77f49.pdfIn PDF document text
    • http://paganel.world/el_reino_de_este_mundo0pl4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_60537443ab064.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/0af853ac-2181-4ee9-9c8e-fc3d10ea30dd/types_of_lines_in_engineering_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c78e47-9883-4931-b2a4-51ae319f8bc5/sodastream_fizzi_one_touch_glass_bottles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cece11-4f68-4a4a-8dcc-d26b07ab7af5/similar_triangles_practice_worksheet_answers.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_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 5584 bytes
SHA-256: cfa95b3ef27832e829f9df44479829e3f144b1a9e78ce6b5fb92cac2f115d070
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10864 bytes
SHA-256: 2d9e0ae0731dbd7108fd754f84acfdef213efc7fc00db4b60812404904c7032b