Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e17a805ecbbe1c9…

MALICIOUS

PDF

65.8 KB Created: 2021-01-13 16:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 94d4aa5d24e93ec504a619f7e3c12d87 SHA-1: 4e808df74c9cefd1175bfab60e6ae01567892204 SHA-256: 8e17a805ecbbe1c9dd19ba806556b89a833a13b1bb8e1690750ec3c1e74325d3
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for containing a large number of external links designed as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the structure of the PDF and the nature of the embedded URLs strongly suggest it is designed to lead users to malicious websites, likely for phishing or malware delivery.

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://traffine.ru/aws?utm_term=the+current+war+movie In PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/mapujelorire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fe7313c74196.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/UichfAd/retroviruses_such_as_hiv_do_what.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/v5jcSjd/kigunatexak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fc47bfe11cc7.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/3102773.pdfIn PDF document text
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/2ef217b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5f928bb3e0f97.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/b84930ebb5c8cf.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/iiae9hb/bexuxalewuvigasurifuxot.pdfIn PDF document text
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/6153276.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/d2f018.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/busutafitufe/57350676699.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/gate_2018_physics_question_paper_with_solution.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_off0000b8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F4 4812 bytes
SHA-256: 263fb3f60c6aa65c74ce39d0f3879a41a2b16892b34b44dc86ce1cca6d51556f
font_01_sfnt_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 10380 bytes
SHA-256: 2224a1f3d821a5fed2fd5d2ffd747090c44d108f431b8f941de512fdb8e2194e
font_02_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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