Malicious PDF — malware analysis report

Static analysis result for SHA-256 0954567d6b3ea12c…

MALICIOUS

PDF

79.4 KB Created: 2021-04-04 01:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4596c031f405000fd13213a46047788a SHA-1: 00da27fc902187c0229772a3a9071047048c6610 SHA-256: 0954567d6b3ea12c74102fda5593fa5d0be4c36b5e9a4b0e52cc7b0887108eaa
244 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document's purpose appears to be to lure users into clicking these links, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=english+8+ball+pool+rules+pdf In PDF document text
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/veliroki.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/xowitetusaduleju.pdfIn PDF document text
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/watumuwew-divet-fuwijepuko.pdfIn PDF document text
    • http://merishwheelrecords.com/jamukowoxijolivalimjd0u.pdfIn PDF document text
    • https://xowiwive.weebly.com/uploads/1/3/1/3/131398234/pegifazofafawi_rumufemu.pdfIn PDF document text
    • http://complerbnp.com/glossaire_maritimelxmlm.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/zixadatuwitupis.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/kimapaxirotugu.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/b0dfb06.pdfIn PDF document text
    • http://usesol.xyz/what_are_the_examples_of_biosphere8prz0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c21a409-5e79-4207-bddf-5d9730b81d84/transition_words_paragraph_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e3a90d-ee8e-4121-92b5-64b702b484c6/livurukawiluvuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73244f7c-e645-45aa-b8a6-09c1a8d7a415/best_c_programming_tutorial_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd3c4fb-418d-49b4-a3fb-378ccd16c941/who_sang_the_song_moon_river_in_breakfast_at_tiffanys.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/xefilubiremegemanasiposak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c2d650-6040-44be-913a-135367fbc526/45975731301.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/ucsf_chimera_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e2c900-71b2-41b8-8a14-4c53660b5c64/tumor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68919efb-19ca-43b8-8a3a-c381ba02e404/black_flag_origin.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_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5592 bytes
SHA-256: 4870a84eacb5b276d700881f2e0be154aa8aad17d8242904b5cc5f0d16a8aabd
font_01_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 11140 bytes
SHA-256: 4ee7d2071d872411880775f8a2977be067f2d20b870e8f9d49ece809b3104d8e