Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6a0a13d86c3600…

MALICIOUS

PDF

86.7 KB Created: 2021-03-14 22:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 51da00bc7c2fa4b2cf9f1eefbd32789f SHA-1: 1fcb55e434090bc821e2eb2f77de1975ff00c952 SHA-256: df6a0a13d86c36006dbbafdf40abd45882126de7637133f468ffb07dfd15bc7f
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting and contains external URIs. The presence of numerous unknown reputation URLs suggests an attempt to redirect users to malicious sites. The document body, though partially garbled, contains text that could be part of a lure, and the PDF structure itself is flagged as potentially malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=desid%25C3%25A9ria+alberto+moravia+pdf PDF link annotation
    • http://magazinrf.xyz/integration_of_cos_squared_theta_d_theta82co1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_601863f17c6e5.pdfIn PDF document text
    • http://abanca-electronica.com/29213185502lw5ub.pdfIn PDF document text
    • http://fastgetme.online/durejajn3nxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fd99b162e0c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fd63d0d61474.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/long_john_silvers_hush_puppies_gluten_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393044/normal_6008dc8502156.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/95585900593.pdfIn PDF document text
    • http://halfraire.xyz/percy_jackson_the_lost_hero_full_audiobooksqjkn.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/b8b5c60f-01b6-4616-9f9d-d4bae36e6ea9/nutrition_info_for_taco_bell_crunchwrap_supreme.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/fobag.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/72157471793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b392140-e2fe-43cc-ae56-760ea6119e5b/zinamiketowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8806f18-215a-4a19-998d-461ba3aec1a1/what_are_operations_management_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96921d3f-9b00-458f-b555-18c0d3a4fc5e/440811330.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/98448607813.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/jidimebuvil.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/piriformis_muscle_injury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9819d25d-9054-4639-b8ad-60d45837cf25/zecharia_sitchin_hrvatski.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5a216e-7a38-4446-9aa5-d539ab4349b4/hal_elrod_miracle_morning_life_savers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f859cf-f5ff-432a-bc6c-9666f6cb8251/75573053369.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_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 5528 bytes
SHA-256: c8f13a4663ab99fea496cae0fcd1a923344cdd23557394bfeafc19ddb5526aa2
font_01_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 12504 bytes
SHA-256: 9fd6cfccf6103a870db0a7bc62213f5ee90b379a6f73a20ebc62f28bbb4b89e9