Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa35ae2cae3d65f…

MALICIOUS

PDF

81.2 KB Created: 2021-05-08 05:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8ea5f0c4592e550aa8cafd9c2434272d SHA-1: 145e788df065b82d71c9c88703d787e723896bba SHA-256: 8fa35ae2cae3d65fd4cc34a78c30ee207feeb503b29910deeed20652bd60c33d
186 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 point to disposable hosting and are likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=my+hp+photosmart+6510+won%2527t+print+black PDF link annotation
    • https://cdn.sqhk.co/weseseme/OiiZjkt/33622811258.pdfIn PDF document text
    • http://ionatr.fun/835323288567lx0y.pdfIn PDF document text
    • http://spainwow.pro/618380253647ovfm.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/mastering_javascript_design_patterns.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/RHl6hbu/balenciaga_sneakers_women_sale.pdfIn PDF document text
    • http://cashfree.store/kiwobejiriiq8yt.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/ibgidgg/43215886323.pdfIn PDF document text
    • http://oneitstore.info/524516034894etfk.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/ia8tjvV/95346507905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_e23867eb41d44af8b7cdcf77f24b4b2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xajowu/mla_format_works_cited_website_template.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/the_stranger_camus_matthew_ward.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/finding_equivalent_fractions_worksheet_5th_grade.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_1a9a1eb956ce47b485c52cbbb8425847.pdf?index=trueIn PDF document text
    • http://desejole.myartsonline.com/22172603367.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_e48b1c4c1cd14578b730e11a7bb06052.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_ac43439b8dc04ddc813d057f8f2a9849.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_1f02c2c621be4fde8c186130373d6bfa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/lake_ontario_salmon_fishing_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/application_for_unabridged_birth_certificate_form.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_a46666d0f1c144caa6130b5866817be5.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_db009e68cf80464f9801e3f8bceeb5a2.pdf?index=trueIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_80a2ebccc1a1451ab79e1815166bb048.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_76a7188582134701bcc5a2fbaaae7ccf.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_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 6080 bytes
SHA-256: eeecf766dc86dc7d5047d585b7cdd8b58f5d51546eafa78d88a909e366400325
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 11512 bytes
SHA-256: 71d95e9c4a36310c00b8910938ea880c57ddb06ab9178022696abb5cc4f99714