Malicious PDF — malware analysis report

Static analysis result for SHA-256 5205f18d655a06d5…

MALICIOUS

PDF

76.4 KB Created: 2021-05-14 13:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 327918aa50cd70c13cfd809999d222e2 SHA-1: 562197b3c8dc7345156007891aeb257c6f8fcf24 SHA-256: 5205f18d655a06d5d2ebaf6c5281f70ae2970cdb6eeb2be7e9df71ba6f034e4c
214 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, including one to a known malicious redirector at 'dafemum.ru'. The document body, though heavily obfuscated, appears to be a lure related to common technical support scams. The presence of numerous PDF links suggests an attempt to create a link farm or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=why+is+my+asus+laptop+not+charging+to+100 In PDF document text
    • https://cdn.sqhk.co/wafavalufa/4lhfwgh/suxipesidananaxisifil.pdfIn PDF document text
    • https://kisinamaku.weebly.com/uploads/1/3/0/8/130814290/f996625d77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_600b462f1af2e.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/765d7ce.pdfIn PDF document text
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/b828c0.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/lFhfhir/80s_dance_music_hits.pdfIn PDF document text
    • http://reassurez-moi-fr.info/josokewufapumajaparajihf6vx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369914/normal_60027c582e4f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_601ee96ca3f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_6061c15876ee8.pdfIn PDF document text
    • https://sapofekotor.weebly.com/uploads/1/3/1/6/131637774/zizigamazive_lubepafe.pdfIn PDF document text
    • http://bestsaleshopin.xyz/xfinity_app_firestickzqv07.pdfIn PDF document text
    • http://chatik85939775.fun/56671287350pjgvc.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/fifomi/86290212564.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_c1d134ebe25d425fad86930cf37056fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/kinijanogo.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/27307761516.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/taliwixidegivuli.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_5a407961cb5b4c2b9451aeac9332e257.pdf?index=trueIn 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 5656 bytes
SHA-256: ce7d726032bedb835d0b6caab623aaf0f520f755aa69ae73d639c7055fd4a11b
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 11036 bytes
SHA-256: ae3694f4649dc09f2e16625d1f5c7a78dfe7c1c0a524d63284b1c08850d3c9b1

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