Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f917e5937805a2…

MALICIOUS

PDF

65.3 KB Created: 2020-11-13 15:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 22f69da3f1cb7753fc51a2980334c040 SHA-1: 1b9157aa91e22e4bd52b599212e5d6d59abf7d14 SHA-256: 28f917e5937805a2e75d3cae764e91da8ac90e1e412f6308a6449874c701d4a6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://traffine.ru/aws?utm_term=boxed+free+font'. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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/aws?utm_term=boxed+free+font In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f98b8e76b10b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f87a8e0d6511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f94f5e2a5627.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/mizadanoxare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fa1657b37817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5f95742a00864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fa1e1c247e8e.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/petuzutemixuvod/dakigenaliwusasoda.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/lefuxorezolulikob.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/why_johnny_still_can_t_read.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/5285757833.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/pulse_position_modulation_using_555_timer.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_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 4600 bytes
SHA-256: a8e3417fd36a3a04f90fc11961cb1c06c2caf7221c963bf27831ebf669e1734d
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 10712 bytes
SHA-256: 1058a09e3a9052967e1160dc19676a7c2adec654ecb1cd6d53e1c91112efb4ab

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