Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d726ef886861d3…

MALICIOUS

PDF

76.9 KB Created: 2021-04-10 22:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c63f932f7449c384f54fa25ee015adc0 SHA-1: 1ef4827c9d3f9d15c51ff4dccfef4c06347e2722 SHA-256: 36d726ef886861d3b425f990ad3f35ca1103c424e89ea65dfb2174c5ed39e959
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a lure to download further malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the sample's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=how+to+do+a+bubble+map+on+microsoft+word
    • https://cdn.sqhk.co/lilavokolet/iebJPHY/61841127912.pdf
    • http://wovuwukotuvoxi.mygamesonline.org/pink_floyd_coming_back_to_life_guitar_tab.pdf
    • http://cooldomen.space/chemical_equilibrium_question_and_answersd74nr.pdf
    • http://redit.fun/bewopekufocd1s0.pdf
    • https://cdn.sqhk.co/munuzimevu/jfienjb/advertising_key_success_factors_examples.pdf
    • http://reduslimitalia.website/bulabivuvuxibugopademalucf9o.pdf
    • https://cdn.sqhk.co/bamewimoxatu/rGjcwzl/20407631267.pdf
    • http://crubr.space/92102828797fa0ow.pdf
    • http://mimisijuz.mypressonline.com/warhammer_40k_chaos_space_marines_codex_7th_edition_download.pdf
    • http://jarevine.mywebcommunity.org/jezigezu.pdf
    • http://chempion.coffee/jixezapilujiwebipokabaykaun.pdf
    • http://gukabibus.mygamesonline.org/vudotekul.pdf
    • http://gouliwer.online/zidulebepumiduderowovoparh2.pdf
    • http://cetakchantek.com/sodium_nitride_is_ionic_or_molecularobjwa.pdf
    • http://thedouche.xyz/atmega328_pin_mappingyy4n2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/787b8a1e-b12d-4f16-9bfd-822a5413cc63/kexusadumosaninezakevamu.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_03157a3238ab4395af50157a3092e551.pdf?index=true
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_09315bb44a174f6a9fd5f63a4521a92c.pdf?index=true
    • http://juzapurul.onlinewebshop.net/zasedeje.pdf
    • https://uploads.strikinglycdn.com/files/95d0fd8c-0e49-4fab-94dd-909cdcad7dc6/neuropsychological_assessment_adhd.pdf
    • https://uploads.strikinglycdn.com/files/d4c9d3eb-0d25-407a-a099-16efdb6878b6/91251930896.pdf
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_5af7f5ee13c24f278e23c9780285abab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c560ce83-a6f4-419b-92a6-e3b1e5b25497/starbucks_cold_cups_fall_2019.pdf
    • https://uploads.strikinglycdn.com/files/b65e377e-c55b-45f1-bb6a-aa96acf66629/bekolimadav.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_5d4f9bbd22684559bb50d05d86835ad6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeef.bin
e947ffad740a5357a18d2d570e01aaab79bc006f4367d04f5b1a369db9a163a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 5492 bytes
font_01_sfnt_off00010190.bin
7199b8c60ca61d484c6abc7baae04c945142578278ea8c8b9391008ca35c79c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10576 bytes

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