Malicious PDF — malware analysis report

Static analysis result for SHA-256 644113befa66175d…

MALICIOUS

PDF

104.4 KB Created: 2021-04-30 12:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bffec12cce4d9e51017c66614782b231 SHA-1: 13dce5a43a245db4ba909bee70dc7402e433a4ff SHA-256: 644113befa66175d6569c2d6e18833d8dc307e0b386c7c157472994f5e21187d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojan payload delivery. The document body, though heavily obfuscated, appears to be a lure related to 'Willy Wonka and the Chocolate Factory'.

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 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://dafemum.ru/strik?utm_term=willy+wonka+and+the+chocolate+factory+characters+wiki In PDF document text
    • https://cdn.sqhk.co/xumefugafa/hgl8gcG/avira_antivirus_pc_free.pdfIn PDF document text
    • http://love-your-lips.online/rise_of_kingdoms_all_commander_talent_guideo2kho.pdfIn PDF document text
    • http://esparks.ru/56947803786i2717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_60678fb00d82d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5fe14bd782ca8.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/6iiYib1/66372819576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5fceab977047c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_605804857a332.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/1298208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_6069fe887b8db.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/QMhieDM/20671505492.pdfIn PDF document text
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/2d3a98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_90f6d55ddacd4430bf777210c154c781.pdf?index=trueIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_c6ce3327fe404ae58f63efde4c8d2596.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7680d0-75ae-4a09-a1c2-c231a653c628/remote_software_testing_jobs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1a79ba-bbcd-4340-b277-9acaf44cb312/sezujaturawum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bdf5be-4506-45b6-9c87-f56e0e3a204f/75582165123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3914731d-ff26-48bd-a54c-644c707f0567/garosudotukowubupodo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15957 5380 bytes
SHA-256: 9a15f5ae7c0d2de9cd3597ff4f5fc26db5e5d946a44c6819b1f2be49d4324092
font_01_sfnt_off00016bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC0 12000 bytes
SHA-256: 740e097564659c6da6b1a0e68e7ff0ed57b36ff36db481ce7030c0126138a3a5

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