Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41aacf7a7ff8dfb…

MALICIOUS

PDF

69.3 KB Created: 2021-02-16 08:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d9a13a7cb39ddafd5235b1321c947eb5 SHA-1: a8d204dbb76ff094a3f4f203710d464a08045269 SHA-256: d41aacf7a7ff8dfb9dc9a3f688468e7e9e788b1fc40fe3c5e1c98f6c87819e92
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to mimic search results for free PDF downloads. The primary URL, 'https://seumenha.ru/strik?utm_term=roget%2527s+thesaurus+of+english+words+and+phrases+pdf+free+download', suggests a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=roget%2527s+thesaurus+of+english+words+and+phrases+pdf+free+download PDF link annotation
    • http://souve.me/chanel_classic_size_guideqytrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_600ba3d16c1d5.pdfIn PDF document text
    • https://pefemodadiz.weebly.com/uploads/1/3/4/5/134520562/rudori-pulugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_600243c3bbf90.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/dy7IkRm/powozifedujesojafidise.pdfIn PDF document text
    • http://smartradiobf.ru/pexunokdlmj9.pdfIn PDF document text
    • https://cdn.sqhk.co/powosinubuk/Y1fBthj/kulavugeviluradataxax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494877/normal_5ff08250b1aca.pdfIn PDF document text
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/009c0bd.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/7UbWjf6/globe_my_business_plan_1799.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/hhXjAUZ/list_pulse_points_on_the_body.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/paxivogedewilu/types_of_unconformities_in_rock_layers.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/child_care_training_courses_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/93315248578.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/nfl_week_15_fantasy_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/winrar_64_bit_full_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/43136110711.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_off0000c074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC074 5320 bytes
SHA-256: fd018c33c8f2c9fcb306b58aaa63c874fa0f2ccaa6d17b9f964b0f745d59b56a
font_01_sfnt_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 11552 bytes
SHA-256: 9a3e21240c97df7b44f8f666da250a6b7741d4d4c8daeb4aff960315a2f890c0
font_02_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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