Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555f786edde6448…

MALICIOUS

PDF

71.0 KB Created: 2020-12-09 19:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d4006aca8c5e5b10bf4cfa6c3570f21e SHA-1: d9e29c42869df4afaf444a3169a12b1636f31224 SHA-256: c555f786edde644836008da1567ad0439af03822ebf3a653ab6766f4053d6895
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic identified a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

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=in+our+bedroom+after+the+war+lyrics+meaning In PDF document text
    • https://gidibaxatum.weebly.com/uploads/1/3/4/8/134889182/xavigifufaten-duxeladi-tizotadozit.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/tabuvip-wesexudos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5fa8d2cde09f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa6263180776.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/xevukaxaput_fikegetenisod_zidasetupotem_ragogodibukekex.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/pazebazew.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/nudirusedokenesuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fc04c3d51592.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/xibemusexomaxotoz.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/398041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fbbd86eeb2d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f9b5f3b06f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fc22a196dae4.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5fcdc75079439.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/mogosaboxebagax.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/muxegeza/caffeine_informer_starbucks.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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 5704 bytes
SHA-256: f707603fe76f03f229413ddd8c0b5b7215bbfaf9a1a0649016400678e2747261
font_01_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 11236 bytes
SHA-256: 29226ff4fcddc8fb46b7f1f14153033722e5a59bf4af7b9f56441531206d3ac6

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