Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fbc744be861df7…

MALICIOUS

PDF

71.8 KB Created: 2020-12-18 08:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5db52c002ca40873100ebc714b0cc3a4 SHA-1: e5fdc036654f68ebd34644dd35e4d973cf61660b SHA-256: 55fbc744be861df7eb357cdccc3a825c449ffb9fd02124bd63ca5136d6828744
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to disposable hosting and redirect to known malicious infrastructure. This indicates a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=des+moines+river In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fc6adab7fb15.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/mapolekozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_5fa4c3b7aaccc.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/vuxunexubow.pdfIn PDF document text
    • https://kutolimog.weebly.com/uploads/1/3/4/4/134435461/fejiwomesuguke.pdfIn PDF document text
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/3815b322ff.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/2522590.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/711c2d52-ff1a-4e76-a8ab-9addc48bf83a/xonorevowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0947459a-6eb7-4b16-9e1a-bc5dfe0fcf50/52696694820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e737196-e7e5-4588-8728-072d896c4533/kikaweladokirojapepozel.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/stages_of_change_worksheet_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/teacher_observation_forms_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/math_games_for_grade_5_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689270d1-c173-4b57-af2e-592d76ba4687/33493201007.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 4648 bytes
SHA-256: 31a211e39730e76eacbdd5a7e2c21494bd0ba63f8de713997d3ab64266357725
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 12624 bytes
SHA-256: 61044a4278b61502442aac5eb5164fcadfb449f1da82463ed648f379926863b1

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