Malicious PDF — malware analysis report

Static analysis result for SHA-256 b288a29abcac643a…

MALICIOUS

PDF

59.5 KB Created: 2020-11-26 00:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8ac1819cf3cab978f2ccbe0eaddfbbe7 SHA-1: 1b453cfee7bc9113486407b326decca4a0c21216 SHA-256: b288a29abcac643af8f2adf80bbaf69951e43a90e0ec469227b9ae73c40f0636
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution attempt. It contains a link farm pointing to numerous external PDFs, including one that redirects to a known malicious URL. The document body, though heavily obfuscated, suggests a lure related to free downloads, which is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=one+up+on+wall+street+epub+free+download In PDF document text
    • https://jefifekelu.weebly.com/uploads/1/3/4/7/134744422/woregebifafideg_xifidoram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5fac5d711df25.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/dotinogag_wutaki.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/ragenuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5fbed7b65294d.pdfIn PDF document text
    • https://ralakugifobiw.weebly.com/uploads/1/3/4/5/134589758/2000697.pdfIn PDF document text
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/fb591af5.pdfIn PDF document text
    • https://rotedovifiwi.weebly.com/uploads/1/3/4/8/134846651/c0fdb6d81.pdfIn PDF document text
    • https://nikalakikezune.weebly.com/uploads/1/3/4/7/134753818/3901168.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/9611648.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/841832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fb33a8ee7c6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/54880348445.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_off0000ab58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB58 5292 bytes
SHA-256: 344d7fb720059f35faafc91bbf1e2e91e42daf0fadf0e64b6bd542207f987a94
font_01_sfnt_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 9916 bytes
SHA-256: 174de9ac47ecf6f5bb71514345c33d2bae6e7bf32818fb26909069065d19812a

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