Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cee4f774c7fd7d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-23 01:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3e3e493dcd661a874fb7215df20c0db SHA-1: d93b74091d8ba3ac69c8e70beddbe50af8c076b1 SHA-256: 44cee4f774c7fd7dfbdb9e570e38310c9d2af75e3552608be9d204caeb43be88
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=panasonic+nn+cf778s+combination+microwave%252Foven%252Fgrill PDF link annotation
    • https://cdn.sqhk.co/rakapuvad/VVjgqa5/mixanurepirideboguj.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/taparadawuk.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/9b8025593.pdfIn PDF document text
    • http://ozalupa.space/5.1_mass_weight_and_gravity_worksheet_answers_with_workaz0o3.pdfIn PDF document text
    • http://medgaj.com/adobe_photoshop_cc_camera_raw_presetsa7u3q.pdfIn PDF document text
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/189cdc679712f4e.pdfIn PDF document text
    • http://gagewetero.iblogger.org/46567031283.pdfIn PDF document text
    • http://busivel.xyz/book_review_example_for_2nd_gradezucqu.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/5767160.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/fxzqFgh/aquarium_fish_trap_canada.pdfIn PDF document text
    • http://tumbaa.space/tinaxadujuzefugitobuwu1egsj.pdfIn PDF document text
    • http://shoop-fp.ru/kevokogiijnp.pdfIn PDF document text
    • http://hookup154.site/hitman_2_ps4_gamestoputkno.pdfIn PDF document text
    • http://ejinaya.com/characteristics_of_human_resource_management_information_system7scgf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwojanapav.epizy.com/1077526384.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/paranalepekivafufu.pdfIn PDF document text
    • http://lojizigakuxit.epizy.com/14402830082.pdfIn PDF document text
    • http://tuvinasonim.epizy.com/mabev.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/client_onboarding_process_flow_template.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 5804 bytes
SHA-256: 9c9109cdb10157e329585d527d2f1e96a3e80c6aa723644cfefc9532292cd784
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 10648 bytes
SHA-256: 1af670ad480286d73e1f3965fb4550e95256f4f2b3a000889f31ec5de292898a

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