Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d89bb7c69df489e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-22 05:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2372409b6ada737de86cac0c386e9440 SHA-1: 3cbc2cd2ce8dca3572cde58f6ac26f9881a4285e SHA-256: 3d89bb7c69df489e6ef6486acff5160c3affd9f656a9e319c2cb03a9633e493e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URIs are indicative of a malicious document designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nipisod.ru/strik?utm_term=how+to+know+if+you+have+a+boil+or+pimple
    • https://cdn.sqhk.co/fepexeguma/hfgiqjc/nuclear_weapons_should_not_be_banned_essay.pdf
    • https://cdn.sqhk.co/juselivo/0gdAib3/dreamworks_spirit_riding_free.pdf
    • https://cdn.sqhk.co/burexewejam/jcjaOQh/rudenifil.pdf
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/5ceec6fdb967f3.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/1a39e4528598798.pdf
    • https://cdn.sqhk.co/nidaruzada/id3hcPG/topoj.pdf
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/menuletifujojusa.pdf
    • https://cdn.sqhk.co/nosimasiv/ehjjcti/zombie_mode_pubg_xbox_one.pdf
    • https://cdn.sqhk.co/vizodejo/iiKheic/nabipufepixupuxunuruw.pdf
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/40d9ac923c5245.pdf
    • http://wuxijuvusif.22web.org/20542630304.pdf
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/talasabapugibotaf.pdf
    • https://cdn.sqhk.co/tategupet/MjcNljg/81379416576.pdf
    • https://cdn.sqhk.co/buvovemif/jjgh6ij/13506424766.pdf
    • https://cdn.sqhk.co/zalopubid/hhaYhce/crash_bandicoot_race_ps4_playstation_store.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wekameti.rf.gd/shoot_bubble_game_new.pdf
    • http://pojaguteketifix.rf.gd/4220195045.pdf
    • https://s3.amazonaws.com/muvevanepen/82783606656.pdf
    • https://uploads.strikinglycdn.com/files/a7c41d28-656b-48e8-b389-27cd72c050b3/wabebemulijef.pdf
    • https://uploads.strikinglycdn.com/files/a2aed0ad-9017-45ab-93e6-95f2e344b6fc/how_to_strength_training_for_weight_loss.pdf
    • https://s3.amazonaws.com/remeranexe/12344525401.pdf
    • https://uploads.strikinglycdn.com/files/1425f9cb-5e5a-4a59-9f7e-e3cd7d81661d/kovivaneba.pdf
    • https://uploads.strikinglycdn.com/files/0d4393c8-8553-4f37-9353-2aa564a36c1f/25940548270.pdf
    • https://s3.amazonaws.com/bitizopovopaso/2013_chevrolet_impala_service_manual.pdf
    • http://zakuvusebaj.epizy.com/91129923266.pdf
    • https://uploads.strikinglycdn.com/files/6bfc618a-ebef-4429-9b28-79a79923b2e0/what_is_the_best_fishing_rod_for_redfish.pdf
    • http://tozibuxadotoba.epizy.com/33226262187.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_off0000e76f.bin
656f9d785f096f291890a1dd1919ca1811132339e5da6c4c73ebea641f8d55f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 5384 bytes
font_01_sfnt_off0000f9ae.bin
cfb55aff0b518079cbf5eb694762c2245c3e52d1f9bb689b6247a369856a98af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 9784 bytes

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