Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bda444d0c6d168a…

MALICIOUS

PDF

70.5 KB Created: 2021-03-10 17:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c418218d7de8f707b6acccb44e530a SHA-1: dbde11df09685587ec195eab708e3614b29d4ecb SHA-256: 2bda444d0c6d168ae62fcb6e18c1f66ebcb7d5d9e9cf9c120b56dae2e0368e16
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, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, suggests a lure related to 'New Yorker cartoons may 11 2020'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/aws?utm_term=new+yorker+cartoons+may+11+2020
    • http://javaxirivibewi.mygamesonline.org/what_is_the_best_old_cast_iron_skillet.pdf
    • http://zonuvak.medianewsonline.com/what_is_ethics_in_sport_management.pdf
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/93cfed4ebc7f5.pdf
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/4984396.pdf
    • https://sutivekawexebe.weebly.com/uploads/1/3/1/6/131636655/likezejij_juginelu_wokulujiki_mokiputepe.pdf
    • http://sopisafexuj.sportsontheweb.net/13974714176.pdf
    • http://nomokesus.sportsontheweb.net/semiwovalasivinudowifi.pdf
    • http://dazolovegom.mygamesonline.org/cuanto_es_1_8_pulgadas_en_milimetros.pdf
    • https://tavovoxiwazufaj.weebly.com/uploads/1/3/5/3/135325502/267e17d.pdf
    • http://retapadu.medianewsonline.com/cirrus_sr22_maintenance_schedule.pdf
    • http://zoluwofemofuper.sportsontheweb.net/80432948050.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/138f1833.pdf
    • https://wuzezabor.weebly.com/uploads/1/3/1/4/131438899/vojelefakufabilobuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_364e4c90e88244b08968981367d650f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f48aa37c-77a0-4339-8c52-92ef0245183b/pidedoxux.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_e0489fea7a9c4d11acb9f3cd66263c23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d33d5045-765d-40c2-9edf-cd4c1d077f4c/15600476419.pdf
    • https://uploads.strikinglycdn.com/files/8a00eddd-3d5f-4921-8550-5a55a11fdd4b/agatha_christies_poirot_season_10_episode_2_cast.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_5386ee3515f341c4a46091f7dbcecd0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/24cc5703-3124-4470-99c9-d3ce3f3255a8/sepoxukum.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_2bf1c568f0274a229f88a3315fb6c905.pdf?index=true
    • https://uploads.strikinglycdn.com/files/46730232-9dac-44ca-982c-052271574425/rajekidurafinitoduje.pdf
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_cb821f0dfbf94273b3d860f47230af0a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d1.bin
5290c976891fe88e1e73bc4115e54eca76f0e982e13de62abf9dc415b5e1b286
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 5208 bytes
font_01_sfnt_off0000db81.bin
c86037a4d317028a0ff7ccc23980f5a57f923f2b9237681551e7a94a981b48f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10248 bytes
font_02_sfnt_off0000fe82.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 4324 bytes