Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac5efb3b19a7d06…

MALICIOUS

PDF

68.1 KB Created: 2021-04-05 13:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 60aaa21c392c38298c92f2b617e70a6d SHA-1: fdf862b0cec2853320e861dd46b8b2857d77160c SHA-256: aac5efb3b19a7d06bb7945356af373e5bbff468e035627a7782a3eae1f95ee13
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/award?keyword=basic+technical+mathematics+with+calculus+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ff5e8f3e79c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fe8bb05dacb4.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/dodige_dovugu_fubisefomedad.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/3haLd7F/giwuzaneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_6046b1172ab2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_600c6ee19eea2.pdfIn PDF document text
    • http://kekanavaresem.iblogger.org/tuwupujeguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_5fd39bf7aa288.pdfIn PDF document text
    • https://mebodamuruwij.weebly.com/uploads/1/3/5/4/135400263/2061160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_604ca7bdbd93e.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/LgihFAd/fun_facts_you_didn_t_know_about_yourself.pdfIn PDF document text
    • http://fafaviga.iblogger.org/35485634009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fc9e2b25abb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_605613e8f1bae.pdfIn PDF document text
    • https://cdn.sqhk.co/bovavadas/hhJFkgf/restaurant_mania_unlimited_apk.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/a3444fc96ee8.pdfIn PDF document text
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/9832563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_6052abc63a8ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovuzop.epizy.com/36566581244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38aa93df-4192-4b6c-9d28-e12c235e4415/43059889287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aff2a66-84b9-4eca-9a1b-4b263a8cce28/18416199578.pdfIn PDF document text
    • http://mewobunodume.rf.gd/how_to_reset_old_trane_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5096d6b7-0159-4cb8-ab21-95753bbb1061/fisher__paykel_dishwasher_error_code_e30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfb9a63-8f2f-47f1-aded-b380982d2fdb/wezisarefobanosefaxaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ecf1df-d916-4c41-85a6-de7fcc7fb0ad/67459011929.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_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 5536 bytes
SHA-256: 66871779034ef03d9331fefa763761b4a7d485688f98bd318258fd43362da804
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 9980 bytes
SHA-256: 5ab317d3812f188168b245cc26beb49e0c0fdb8afdc0e1e44d07c316fdff2f33