Malicious PDF — malware analysis report

Static analysis result for SHA-256 50038b0ebe75dfe7…

MALICIOUS

PDF

67.4 KB Created: 2020-12-15 23:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 892437cf4d754925a11bca4659c5fb7d SHA-1: 289e39b31a46c490026ddd725f85251ffdfacc0a SHA-256: 50038b0ebe75dfe74741c239092c3f7c46c0b94abaf41fbcda325777486133df
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=soroptimist+international+of+the+americas+bylaws PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fa2d6860fe15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_5fb51d28872f7.pdfIn PDF document text
    • https://visenapanelowoj.weebly.com/uploads/1/3/4/5/134581819/50784c436.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/vuvimow.pdfIn PDF document text
    • https://kelinabak.weebly.com/uploads/1/3/4/7/134728495/8727429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5fbfa51c8174a.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/dubumesarufaleb_mugefutaduxik.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/vegijotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fbb21524bd53.pdfIn PDF document text
    • https://kikosubulu.weebly.com/uploads/1/3/4/8/134884397/buxumopemavurix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f91a12a79de8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/44394aa8-ad3e-41ef-b1cb-15f5ca8b4346/begivuver.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/chapter_9_chemical_names_and_formulas_221_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d837f8-6216-4de4-b103-7e6203b94a28/zesejazevesaputa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd66c26-9dcc-4388-a23b-b0fa5d83e31d/zabekawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb98c64-f312-405d-ab72-dfd7e99be05f/vaginal_bleeding_in_dogs_not_in_heat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA9 5480 bytes
SHA-256: 57b062f273c8f006218e911386a0abde79f6d8be12193fe86acd8d59b618e52f
font_01_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 9640 bytes
SHA-256: f78e581a290bae27a77f97fda70d04098869fa8cfcde39d09cf07dd55165d8a5
font_02_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.