Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fc5982a7805a5d…

MALICIOUS

PDF

83.9 KB Created: 2020-12-02 22:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55ddbe7ac1e3214bb9a072f5eaf796e5 SHA-1: e691a29a87edfeea8c42c9a135412b4b533cc232 SHA-256: 86fc5982a7805a5df5c7f41363ede3dd91eedc4961f6b1381249276ca0af8aa6
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 large number of external links, many hosted on disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The presence of a link to a known malicious redirector infrastructure further supports this. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to host and distribute links, likely as a phishing or SEO spam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffmen.ru/strik?utm_term=6.1+adding+and+subtracting+polynomials+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fad732eef38f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f87273b98a88.pdfIn PDF document text
    • https://xinulirolome.weebly.com/uploads/1/3/4/5/134599248/vaxude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f8b9f14740ea.pdfIn PDF document text
    • https://vupubajuxik.weebly.com/uploads/1/3/4/4/134492473/6b346cff90.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/9884818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f96e9e618adf.pdfIn PDF document text
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/275d30.pdfIn PDF document text
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/9734143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f9756c104660.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/lituzegusuki-vizunugejugoped-falukezogiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5fb9cab196d86.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://s3.amazonaws.com/meludav/74008101404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdb7f90-7f59-4163-94b9-09bd801e060c/kizekewef.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/pozaligaluzugadu.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_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 5816 bytes
SHA-256: c561b9c710c51c5c9fe27263450b32ab8cbffdfa93854fb267386d60e8b9b0c6
font_01_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 11172 bytes
SHA-256: 7d255677364f6007b7b8db97cf5eb2571090b2ba8fb6ef80a1c71fa4e0ad2a86
font_02_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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