Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1fa539cc67aaff…

MALICIOUS

PDF

76.2 KB Created: 2021-02-03 17:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2dbf37305d692d8d3cbd0c7609eede49 SHA-1: 95dae0bc5fcb42ff4d265bb06e4f91982dc40dd1 SHA-256: 8b1fa539cc67aafffc7136814fd6d1d12472139c37e686730f1f283c41995ae8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/aws?utm_term=plastic+sheet+extrusion+die PDF link annotation
    • http://rezotu.xyz/lepepidajaxotumwlsbl.pdfIn PDF document text
    • https://letunaxure.weebly.com/uploads/1/3/1/3/131383761/63e6f633e0ed.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/xefijel_mojetupinul.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/9bbe263f3fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/ihjhswP/halloween_freeze_dance_for_kindergarten.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/zejapat-xufezibukimopa-notumepif-jamure.pdfIn PDF document text
    • http://reduslimitalia-official.website/time_traveler_s_wife_netflix_release_datex2uyk.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/797b0ca061cbe59.pdfIn PDF document text
    • http://bobr.space/mineral_oil_pc_kitza86l.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/hbLjfhj/frog_paper_bag_puppet_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jiAsiio/ziwugaf.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/gasamo.pdfIn PDF document text
    • http://all-system7.xyz/el_sufismo0itj5.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/hegjlgd/infection_humanity_s_last_gasp_board_game.pdfIn PDF document text
    • http://look-hotel.com/73552730229vtpx4.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/ifjchjs/overlapping_events_probability_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/iciboeV/amazon_kindle_app_download_apkpure.pdfIn PDF document text
    • http://figufesivinex.22web.org/nilupuk.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/a7B8C3Z/16763306972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wodasakuzetu.rf.gd/13181549896.pdfIn PDF document text
    • http://wilafeduzavedew.epizy.com/fgo_2016_summer_event_guide.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/chapter_24_apush_review_answers.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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5096 bytes
SHA-256: b49cc7f8499cc34682bc0b7805b8c509713a0fcaa038d055b9264d2a8f464572
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10208 bytes
SHA-256: a40dfa35bf67fb753aab3af0731a15afa64d4a2566d994044cb03d9d14b6de6c

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