Malicious PDF — malware analysis report

Static analysis result for SHA-256 881c6599b411a7c0…

MALICIOUS

PDF

76.9 KB Created: 2021-01-17 09:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef0e6316deb2c6b785826073432e9981 SHA-1: eed81ad614bbebc58dca8acf51506a391c0c2558 SHA-256: 881c6599b411a7c0eba5f32bb3f03ba0216aceacb80c97fedaea13ca9ba0a212
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, particularly 'traffine.ru' and 'cdn.sqhk.co', are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=arc%20elementalist%20poe%203.%2011 In PDF document text
    • https://cdn.sqhk.co/ruzaxube/uggj5D0/57725017462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f9c0e1da529b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f969c948eee6.pdfIn PDF document text
    • https://xekelubapakam.weebly.com/uploads/1/3/4/4/134499273/fopowenepat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_5fa991e3c4395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467601/normal_5ff0315c4a572.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/mijedusovineti/27538338687.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/penefujurefonugate.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bluestacks_windows_7_32_bit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/xipibutegog.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/70003906955.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/permit_to_acquire_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/biology_question_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/bollywood_hd_movie_free_for_pc.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_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 5316 bytes
SHA-256: 8396c2a33a9fb6dc30ffb29face7a76de77effb2a73c063d8626b2a400c57ddd
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 12976 bytes
SHA-256: 9641211d5c928f7d9c82ed9cdaf180e9e928a5596dfe0d2dea1a74994a95d206

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