Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c44c4cf5ca1848…

MALICIOUS

PDF

80.0 KB Created: 2021-03-14 17:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a2067a3c5d6057d301db55452df01d8b SHA-1: a76333da1ab2d7ec67d74bb43c99dd2f62dc7aed SHA-256: 59c44c4cf5ca1848e9691531a18a51c6b18662c329243018ad0516a1649dd64c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains keywords like 'Fifa 16 android apk' and metadata indicating it was generated by wkhtmltopdf, often used to create SEO-optimized content. The presence of external URIs and a high ML classifier score strongly indicate malicious intent, likely to redirect users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/wix?keyword=fifa+16+android+apk PDF link annotation
    • http://ig-soft-team.com/stuck_in_neutral_bookbd504.pdfIn PDF document text
    • https://cdn.sqhk.co/degamuwubela/dCgjzGq/ringtones_galaxy_s7_edge_xda.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/4646574037.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/44253959411.pdfIn PDF document text
    • http://all-gopro.com/446619688581npm9.pdfIn PDF document text
    • http://kabuzajo.22web.org/61876905298.pdfIn PDF document text
    • http://pek-24.cc/88854659977h3f3o.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hh7YHif/coin_tycoon_free_spins.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/bhbiiij/mini_dachshund_breeders_pa.pdfIn PDF document text
    • http://migerov.xyz/530214346911zjoc.pdfIn PDF document text
    • https://cdn.sqhk.co/kigakikijebo/dKSOgdE/lowajewirekiweju.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/what_is_the_iron_curtain_referring_to.pdfIn PDF document text
    • http://purpless.vip/nojivevat6140t.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/b1eea542-93ba-4ff0-abad-dfc19d1e5b3c/kifujojudarikorobubeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebad6632-f3f5-41fd-ad79-765dc44ae01f/litedadep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd59094-264e-497c-9562-ad3f85a48268/34074433029.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_5ccb5c2eb55149d6ad677b12f60815b4.pdf?index=trueIn PDF document text
    • https://9678a7a9-f564-48eb-8833-0a13c7d3594d.filesusr.com/ugd/3835dd_c7a3166fa1dd418a82507afd2916a445.pdf?index=trueIn PDF document text
    • http://baledur.epizy.com/burp_suite_ca_certificate_for_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2779b032-dc83-45e9-a9a3-41c40de96b74/los_ros_de_color_prpura_2_descargar.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/tamil_alphabets_writing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d7b7e2-b268-483b-a323-d7660218d827/organizational_culture_survey_tool.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_7e2b4c5951bb4e1d9a5bd86674b8aad6.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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 5052 bytes
SHA-256: 8a5f4d2d3ddfefe4a7dde80b4abe27c25dd8c5f25355c844efd5253f36c1c71b
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 12120 bytes
SHA-256: 3b353c8465dbcaa996c0c2e23bbbc4cd9fcf7d18bd1a68e4642338a9025ae595