Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa02dfd1bd38b5b…

MALICIOUS

PDF

74.5 KB Created: 2020-11-23 16:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3178b0821232ae9393b01a59af169666 SHA-1: 7415720d2fe4873ad873c3b84f7ca7b15c09fc93 SHA-256: afa02dfd1bd38b5b3a1f2e58c33bf884806e870cd6373926fe261e7e230866a3
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document and hosts a large number of external links, many of which are SEO-themed. One of the embedded URLs, 'https://traffset.ru/strik?utm_term=microsoft+layer+for+unicode', is flagged as suspicious and likely serves as a lure. The document body, though heavily obfuscated, contains references to 'Microsoft layer for unicode' and 'wkhtmltopdf', suggesting a deceptive pretext. The presence of numerous external links, including a link farm, points towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=microsoft+layer+for+unicode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461525/normal_5fa365b7cb70f.pdfIn PDF document text
    • https://lokedidige.weebly.com/uploads/1/3/4/3/134315074/gowem-zivob-gosukebu-mabolupedoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f9c70b57e276.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/5498942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f8bac591dbb1.pdfIn PDF document text
    • https://xeganixirutor.weebly.com/uploads/1/3/4/5/134508666/d9615a5bc19446b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fad5d805f573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5fae4b2887de2.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/xafufuzobixejuwesu.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/2200449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/wichita_arrest_records.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/36290761465.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/mcat_official_guide_questions_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/31126088960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3332669a-16e1-4f87-a5ec-1080a48221f1/ralph_mcquarrie_star_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c447e511-cb1e-45d3-b4e2-466b7b8d4725/zotujirupelumagerof.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/32017685654.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/89224987553.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5124 bytes
SHA-256: df99c565ff9f0fbd2bb68c501247cf9d5dedbb9c64a235b15476ebfb2ace1d2b
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10924 bytes
SHA-256: cad8b1b7c20541e2cc62b45e35650f3f653f0ea5d892d418588ee0186496d3d0

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