Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61dfe23a506773b…

MALICIOUS

PDF

78.8 KB Created: 2021-06-12 15:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08e32dc29bacbf6a2446af474c9dafdf SHA-1: 22ad881b5ef9561cebdca774e737a61d58efc1d2 SHA-256: a61dfe23a506773bcfa18797e4c69a9fde15416bc211ea4c6cc9c64e938f5128
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://huntic.ru/pbw?utm_term=famous+bgm+ringtones PDF link annotation
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/wepirixarovanuwaj.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/kigizobudozabi.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/kezesidodilotopi.pdfIn PDF document text
    • https://gijojipile.weebly.com/uploads/1/3/1/3/131381352/e33d439.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/kilubigelinojupuxeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144794439/bedurijuxalat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb7b284-5d6d-4efa-b5ed-5c66d3ea6e9f/canon_pixma_mx922_reviews.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/reruwusawofufugava.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/41358423412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27749cad-e79b-4291-9e72-c9d0f34347fb/23285329050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c16eec-e0cd-4932-90d8-42d83640c0ae/alpha-phonics_a_primer_for_beginning_readers_free_download.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/sakopujitoxebonatode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896745c9-4e2b-4e66-800d-0a1c809b5c8a/examples_of_using_active_listening_skills.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144781359/how_to_draw_basic_body_shapes.pdfIn PDF document text
    • http://safopiluzaw.pbworks.com/f/wofojozogolaxanabizevo.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/zovaki.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/145026675/chemistry_a_study_of_matter_6.10_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40878be-3fae-4425-84ca-aa7d27c23ea1/selixel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f0f8dc-78a0-4b5b-99de-2668be3b3a34/wavevubijabumewagujofaxa.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_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 5068 bytes
SHA-256: c6ba3af2313b376ae9017d3db81a15a89c6d4c1d1bbf33913406d4f01a0f48e9
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 10336 bytes
SHA-256: ba2e481e52b345c5423a9d523f4b718a37e8fc67a215366af17730ace23ea985

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