Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b56872d141bfc6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-22 18:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4922a527141a63830fd685b1b906fd19 SHA-1: dcb0e6b2cc93a956ca2baae2855e3b4b0d30836c SHA-256: 22b56872d141bfc6cdb876b7e76cde8deaf4d01179eff6ffa3e0437a216e0f7d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=teeter+hang+ups+f7000+price PDF link annotation
    • https://cdn.sqhk.co/dowivita/dNjgaha/zireturuvexiludos.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/f6f8c2.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ejjziaJ/vorediwu.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/61c03.pdfIn PDF document text
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/8316526.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/5055956.pdfIn PDF document text
    • https://xoburevedevubuv.weebly.com/uploads/1/3/1/3/131380480/reninu-sipubakexitumo-memosefilolod-xuwefapu.pdfIn PDF document text
    • https://cdn.sqhk.co/jetekujob/fjcdjfi/93582365552.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/426713.pdfIn PDF document text
    • https://menudapopejit.weebly.com/uploads/1/3/0/7/130775932/c9a0f9f6e279e.pdfIn PDF document text
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/62bb858c.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/vevomagapuxidevo.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/7510378.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/nowagimopuf.pdfIn PDF document text
    • http://razinotadoxali.iblogger.org/child_development_and_pedagogy_mcq_in_english.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/905773.pdfIn PDF document text
    • http://nesejanemik.22web.org/o_que__informao_biblioteconomia.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/4baf94d3-6522-4db4-973d-6173a556fdde/2010_toyota_prius_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79aa02a-f8f3-4bf1-8245-5fd8ea0d4815/can_you_print_on_cricut_removable_vinyl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff76981-b332-4963-be89-66caea5d2b20/viwotafovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad94930b-f855-4db5-b469-fce320e0fbbe/what_are_the_3_characteristics_that_all_living_things_on_earth_have_in_common.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644adb68-5c99-4bec-9ffa-d9b774ca27ed/xorizesuzadivatumotaveta.pdfIn PDF document text
    • http://jijaxipejor.rf.gd/35279470989.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_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 5416 bytes
SHA-256: 6f84549878805d1ae7447e4dd49a37719e1905af896424a31f39a21e0c0addc8
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 12240 bytes
SHA-256: 6d60c5a9476cae48f2eab74b065d2154b6989aa5b9af48dd0a833171e6dbdeeb