Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f80dce0281d4c6…

MALICIOUS

PDF

66.5 KB Created: 2020-12-19 20:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 41c76d1d918548e79bbcbe0190e5f8ee SHA-1: 983146c74a799708cfa19eb60981e2e458358549 SHA-256: 80f80dce0281d4c66ff2dfa9e6da589b9fd237f3282f806420b5071cad802906
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=irs+mileage+worksheet In PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/679edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f9c7a771e474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f8b36e467fbf.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/4049192.pdfIn PDF document text
    • https://xazusajapefo.weebly.com/uploads/1/3/1/3/131383727/a53689fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fd9cca572d54.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/jobowakovaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_5fdbcc626cd35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f978d744ad0e.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/fisulefajow/tuzubosogupavogoguxesim.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/beatriz_sarlo_instantaneas.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/walerato.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_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 5192 bytes
SHA-256: d7be4f11cd65f84746507368ed82e2489ebd6ff5ae2a64b06d506350eff8dbfd
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 11432 bytes
SHA-256: 6846bd8d5c4eae3c503ec2a8c94eeb8a52f7f87fe1f38c5b844ed38846d50132

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