Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae3bc7d12b4fd90…

MALICIOUS

PDF

82.2 KB Created: 2021-03-30 11:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3822dfa34d82cb878095e8821bd6e6d6 SHA-1: 102ecc246e86d14c3a29b9cacefd0955e8edee54 SHA-256: 0ae3bc7d12b4fd902edbbb25eb7e3926e151e971699797e77282fab207542c81
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=how+to+turn+on+mitsubishi+tv+without+remote PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414873/normal_60021843972f2.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/belexeritobowigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_602640dc985d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5ff8ff58c98e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fcd6d8349df3.pdfIn PDF document text
    • http://tirudibemaj.22web.org/kevopemi.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/79393991925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/df28c2bf-1eae-4a63-80c0-811d7f8da0a4/freire_pedagogy_of_the_oppressed_chapter_3.pdfIn PDF document text
    • http://vijanemafe.rf.gd/gapafemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2386ca-75a7-4a19-b111-b5344ceeeaac/high_alkaline_foods_for_dogs.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_ace6c0eca33442ce890d3163bf5023cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5efcdd1-3539-4769-84b0-0d405fa517ae/what_age_should_you_be_sexually_active.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebfe901-42fb-4217-86c5-bb41d79eed87/44840159029.pdfIn PDF document text
    • http://laraxeramamat.rf.gd/immunotherapy_for_lung_cancer.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_dcca0a08e5974714b0259293c53a7a44.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_aacf4b21c367467bafe91c1e9b08e036.pdf?index=trueIn PDF document text
    • http://wivowutone.epizy.com/finding_slope_worksheet_grade_8.pdfIn PDF document text
    • http://warurodezum.epizy.com/bella_ciao_video_song.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/75537278277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9451cf8-2986-428e-b8d9-149757b6522c/what_are_the_common_questions_asked_in_hr_interview.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_731474b201a5470ea83cb4379ddb56b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b37f97d-310f-46b1-b70b-1065a9bb6108/33956798468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b981cfa-73c5-4a18-a802-b7eed8c37eee/biomedical_engineering_unsw_handbook.pdfIn PDF document text
    • https://b1fdf235-84a1-4479-ba44-7fc4a4f983d7.filesusr.com/ugd/afcd87_443a8260e2af49dab88f2effd5bcf0e9.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 4820 bytes
SHA-256: 0966659a55611d788cdf03294044e3a8ff7d8d7a3d0a9b9f86df20273efb0eed
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10340 bytes
SHA-256: 3f04a2aaa1438b126d0acea244721543c3d2163c8d80273409726349bf7d8aac
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378