Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2a4af1866458d9…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 02:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9857107412d8e0d9a029ef80b0ff0d08 SHA-1: 9c96b907ed0554188a1b2779db70c6c03bd526b1 SHA-256: ad2a4af1866458d91813fd12de336dc9c6e8e29a0130180bd1dac1ff103644fd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs suggest a phishing or SEO manipulation scheme, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=tricks+quantitative+aptitude+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/rizinutix/idjf6jc/khore_bubble_pet_carrier.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/gjibCNH/rf_online_auto_clicker_free.pdfIn PDF document text
    • http://intereriia.com/stihl_ms_150_tc_best_pricemloum.pdfIn PDF document text
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/mojezedodimi-zafadade.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/xezok-zorinulaxamu-fotomaxini-jiwajipire.pdfIn PDF document text
    • https://tomovomat.weebly.com/uploads/1/3/4/6/134617768/suwaxi-dopowupazam-kebimubebi-dazabavuwibejin.pdfIn PDF document text
    • http://raftgjgr.space/11_snf_arapa_ders_kitabblrb5.pdfIn PDF document text
    • http://atlas-copco.su/saturated_fats_contain_double_bonds949i6.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/watakidexa-zuvoromun.pdfIn PDF document text
    • http://dihtyar.online/jikeg2ij52.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/lutot-tejabiwuruselun-sotunupu-xuvorajafexux.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/authorization_letter_to_pick_up_documents.pdfIn PDF document text
    • http://blacklaser.ru/29648606983qnja5.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/ddd6b5a1bd090d.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/kiwiza.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/kodakalugilego_mikarepa_rakazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a528799ccf7b4bd6bb8d9d7c95409a82.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_de109e5cbecf4c94b76ed923e0955ac6.pdf?index=trueIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/dedunumafebiz.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_ffaac17bfb8c4b72b9dae11545a7d7ba.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_8ce7aaa15c2b4fcab493559eace03a92.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5316 bytes
SHA-256: 6e5242ee45e8c721b68081da8d0e7f67840a209e539e622c3a07174f269e5d26
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 11324 bytes
SHA-256: 852fb5868ec2a3ed1beeec68f8e048d7ef8eec5d0a468bffa4f8c197252ea4a9