Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4729b360a8fb92…

MALICIOUS

PDF

78.8 KB Created: 2021-05-10 19:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a8b11ff2908da50b3276691948025406 SHA-1: 79fd90a0f5aec9c5212ac00c9ec20bca18c8b458 SHA-256: df4729b360a8fb921a81d09036ed7aeef22c9ea25497c08c40822fdf755de138
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=latent+public+opinion+refers+to PDF link annotation
    • http://lavka-karamel.ru/contoh_amdal_pabrikwx8uc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5ff6209e6e712.pdfIn PDF document text
    • http://onsideball.info/168307152541d64f.pdfIn PDF document text
    • http://myfavoritesun.xyz/washington_museums_hours_of_operationa1uuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_6037b84c7d1c4.pdfIn PDF document text
    • http://storergoods.site/why_does_my_dog_put_her_toys_in_food_bowl2fl3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_6043e97c46893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_603e3bbaadb31.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/Jigggj1/download_fix_the_item_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/jj4ijgc/73664708148.pdfIn PDF document text
    • http://healingtunes.ru/what_are_the_different_types_of_structure7nhiw.pdfIn PDF document text
    • http://linza.media/pretty_little_liars_the_perfectionists_dana_bookerfgzr5.pdfIn PDF document text
    • http://levantemosaic.com/18818414604mh4vl.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/geRFs3d/moist_chocolate_birthday_cake_recipe_uk.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/setasidafi.pdfIn PDF document text
    • http://marketitaly.info/the_last_wish_witcher_3_bookpg73m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_6032735191296.pdfIn PDF document text
    • http://helpcopyright-service.com/siroputopiloxuzjutbd.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/24cb7ba8-0781-4028-8e9d-589f098eb343/pojifadivonoguwebewo.pdfIn PDF document text
    • http://zekezixurul.onlinewebshop.net/63233826927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e908b785-a50c-4285-a9ac-0e5a7acd921d/43865419964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02187cc-ef78-429f-8899-89ce9fccd0e6/the_things_they_carried_summary_chapter_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04fdef7-5402-4c22-8481-41b8e5d05000/dlink_router_dir_655_firmware_upgrade.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/83817082988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dea88a5-6c21-446f-bc23-e98f1abb07fd/31227791894.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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 5092 bytes
SHA-256: 430947673ad1a3e30668a06e851e702d30702c0c7def06a8e31e93b24219e869
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10716 bytes
SHA-256: 2fdca498a0bb2bbfd2993be0a9c3b5f9fb36fae6a3742405723d585383c2da5b