Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2316d4ae7bbfd8c…

MALICIOUS

PDF

90.1 KB Created: 2021-03-14 17:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e43f958b2b81da6f297508d37d381eb SHA-1: bfb7b88f109c27356706e596ffb884350ae3bf47 SHA-256: a2316d4ae7bbfd8cd19d96822b9d667b51c22afd5fa92ee0cef439c93812505d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ponafet.ru/award?keyword=bacteriology+microbiology+pdf
    • http://bejisosubonito.sportsontheweb.net/ernhrungsplan_ketogene_dit.pdf
    • http://wodekenizowa.getenjoyment.net/what_was_the_first_rap_song_recorded.pdf
    • http://vixabaj.scienceontheweb.net/what_is_the_best_pulse_oximeter_to_buy_for_home_use.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_6025ce84ec2f5.pdf
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5ff113b2d5fde.pdf
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fdaaf2dd4ffe.pdf
    • http://bukupiduge.mypressonline.com/67787936789.pdf
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/nufefigowudiditide.pdf
    • https://cdn-cms.f-static.net/uploads/4501965/normal_60321fb477d50.pdf
    • https://nixotebiwozo.weebly.com/uploads/1/3/4/6/134667174/1175459.pdf
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fd1724e59df8.pdf
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/kalokide-loxetomej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vapelurowar/fha_guidelines_on_401k_loans.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_1138d0637b4648beb4f3c8f1ac4e3de7.pdf?index=true
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_3ecd9f5ff67e4a79b35146840f210207.pdf?index=true
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_f06fe5a518d54ed9b82cea63e04db08b.pdf?index=true
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_8e9a78b9fc8941848255ebfcc93ddb4b.pdf?index=true
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_f607dae4f53b40a390bdf0c0fe3d7643.pdf?index=true
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_2026603d86ca4d6ca73a1d069877087f.pdf?index=true
    • https://s3.amazonaws.com/loneminovu/can_you_keep_a_secret_lyrics_twilight.pdf
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_4de34cd08cf740ccb59b1127348df28b.pdf?index=true
    • https://s3.amazonaws.com/napoledunadigo/67200915496.pdf
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_79575d0ba7ba4f0f8a261afbcc7f477f.pdf?index=true
    • https://s3.amazonaws.com/rovuweraja/will_my_pc_run_flight_simulator_2020.pdf
    • https://s3.amazonaws.com/vososasoxumete/zebas.pdf
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_8714a2245b894781b52ea1103e74503a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf2.bin
30f698d43724ba40f7c12a579372a300dca98028d712759173715d81699acd5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 5588 bytes
font_01_sfnt_off00011eed.bin
d70d0ff6ad54eb4ee0e702ef0cab6427a2a5103502431f47a670dca3020e1cfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 11424 bytes
font_02_sfnt_off00014610.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14610 16060 bytes