Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c405a422a4bd4a…

MALICIOUS

PDF

79.5 KB Created: 2021-03-07 23:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 00282798266d5edd96f2aff2fcbba16e SHA-1: 77ce1049d5bac71e88522e80aae83892feee1349 SHA-256: 57c405a422a4bd4a9bc85e8d721901b1544bace2a8e4c206658c53bbf6aa5371
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents. The primary URL, 'https://resalured.ru/wix?keyword=fallout+apk+mod', suggests a lure related to game modifications or potentially phishing. The presence of a large number of external links on disposable hosting further supports its role in distributing malicious content or leading users to phishing sites.

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
  • 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://resalured.ru/wix?keyword=fallout+apk+mod PDF link annotation
    • https://s3.amazonaws.com/tafogusegabomu/public_speaking_anxiety_natural_medication.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/comment_actualiser_formules_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/hdUjgzO/wingstop_deals_thursday.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_603b96f323fe3.pdfIn PDF document text
    • http://copyright-services-us.com/what_is_the_geometry_of_a_carbonyl_group0vfab.pdfIn PDF document text
    • http://kfcrabota.ru/socratic_questioning_methodguyb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_60433bd04970b.pdfIn PDF document text
    • http://cashfree.store/smashy_road_wanted_2_zombie_apocalypseok5ps.pdfIn PDF document text
    • https://cdn.sqhk.co/xajimujigaju/cMlidhb/funny_soccer_physics_3d_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/51268695979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_a2f56911eef94e3aa369872ebbb2692b.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_08b81d5316d340b6a26667fb2f3e3ecc.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_c5fa5400d5924885b17b8881711a51d6.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_b71442069be84636a7394f9163db7340.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_16666e77e53b45e1959ea903cadec12a.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_c62c06f290e549eea0822d752d5e280c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 4852 bytes
SHA-256: bcf76bf8cb0cedb1591413c9cbb0489c4dabacc6742d189ade3483fab574bcf8
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 10644 bytes
SHA-256: 020cf8568b999ad6e5354ec94b4ffc2f063c211b3354fe61e6b09410ed2c2700
font_02_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16076 bytes
SHA-256: f283a563ee48c68d0f210b91d059b93f2da97875a4894e08c15e1f8ed5b97a7d