Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae35c4909d55bc63…

MALICIOUS

PDF

74.3 KB Created: 2021-03-27 20:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10729826fcece5eb2a6d8ce64028aa3 SHA-1: d576f1954e825ed56995acdfce652310ec67bc8e SHA-256: ae35c4909d55bc6307cbaa679862627110d34d8d67610d5edf3f018caf247b5f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://botokaw.ru/123?utm_term=telkom+cancellation+of+contract+form', suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://botokaw.ru/123?utm_term=telkom+cancellation+of+contract+form
    • https://cdn.sqhk.co/kunutewiwit/ggFfhfT/munawobaxe.pdf
    • https://cdn.sqhk.co/tifobebe/qMiirTs/shelter_animal_rescue_group.pdf
    • https://cdn.sqhk.co/nojedajoze/fgfeQie/19167525375.pdf
    • https://cdn-cms.f-static.net/uploads/4425933/normal_60247cc19a104.pdf
    • https://cdn.sqhk.co/tunuviju/5qiigZA/happy_chick_emulator_english.pdf
    • https://cdn-cms.f-static.net/uploads/4365656/normal_6029a569e6728.pdf
    • https://cdn.sqhk.co/damukowabij/ekjehjF/fafevurivibenuxonomixa.pdf
    • https://cdn.sqhk.co/kerametunal/S6Siegg/wovopapesubumedapimi.pdf
    • https://cdn.sqhk.co/ranetixeba/aKibSJM/origami_heart_instructions_printable.pdf
    • https://cdn.sqhk.co/zapajugadira/bohicif/novurowiwuwopake.pdf
    • https://cdn.sqhk.co/noxobabidof/VLydlge/dinosaur_survival_island_mod_apk.pdf
    • https://cdn.sqhk.co/zezinojox/2jadha2/zeduvaluwoduzovefilek.pdf
    • https://cdn.sqhk.co/pijajawopoji/ajhggjg/zixol.pdf
    • https://cdn-cms.f-static.net/uploads/4451742/normal_600fa8ec88a04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasudikek/8484129434.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_9021dbab67b6419aa3316ccba485e950.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_7c5efc28fea74f23b07267d2b9d6f952.pdf?index=true
    • https://s3.amazonaws.com/pazerogasarinu/forex_pin_bar_strategy.pdf
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_a342813728b34aee911915780b60c71d.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_cd06c83561774bfcb3da7a9e58f64960.pdf?index=true
    • https://s3.amazonaws.com/kuxegu/abcd_2_movie_song_tinyjuke.pdf
    • https://s3.amazonaws.com/zalomi/gopro_hero_5_black_guide.pdf
    • 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_off0000e71f.bin
dde1fc2a5c0effb9b36bd695139cfd32a66a8c792971db1a8978b3d438802983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 4860 bytes
font_01_sfnt_off0000f799.bin
55555ae422e6e1ecc377c169639783d50cbdaaa3eeafc95b91bfb3394b28cd28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10636 bytes

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