Malicious PDF — malware analysis report

Static analysis result for SHA-256 81925b229badf3ec…

MALICIOUS

PDF

76.9 KB Created: 2021-06-08 13:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf2884cec6a279fb379bc7f9a67151f SHA-1: 71666e0fac2f7ec8e4bd4335c2e8d4ec93c45a37 SHA-256: 81925b229badf3eca0ba2efb03bbd2fc4d02cd0ce91fe65d5d5cd86692c092fe
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to direct users to potentially malicious websites. The primary URL identified is https://inwebjor.ru/pbw, which is likely part of a phishing or malware distribution scheme.

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://inwebjor.ru/pbw?utm_term=the+leadership+challenge+how+to+make+extraordinary+things+happen+in+organizations+6th+edition+pdf
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/98cd11f431f7bb.pdf
    • https://telewapoki.weebly.com/uploads/1/3/4/8/134897398/99af7530.pdf
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/gukavob-rizokemifup-xejogako-xogewuxakata.pdf
    • https://cdn-cms.f-static.net/uploads/4378856/normal_6029eff1311b9.pdf
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ff684cf466f9.pdf
    • https://goxuxogegeta.weebly.com/uploads/1/3/4/6/134688707/826341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/23f913a0-68a0-424e-aa18-13cf010848e1/79125833711.pdf
    • https://uploads.strikinglycdn.com/files/2f576422-d579-4b41-a7b7-9f74a61908d5/tamofonikuxumedixovanegu.pdf
    • http://jolowajuwijo.pbworks.com/f/bs_bahl_organic_chemistry.pdf
    • http://gakuwibed.pbworks.com/f/exemple_bon_de_commande.pdf
    • https://uploads.strikinglycdn.com/files/35b9bbb1-cd2b-473d-9ec2-f5a7f6211bd6/35438819465.pdf
    • https://uploads.strikinglycdn.com/files/de114002-3fd8-49f6-8a95-4dda20fc97e8/79561389987.pdf
    • https://uploads.strikinglycdn.com/files/95e119eb-01e2-43a5-9d2b-87ee1d417f5e/4.3_mercruiser_compression_specs.pdf
    • http://pupowivala.pbworks.com/f/98469972767.pdf
    • https://uploads.strikinglycdn.com/files/3916e4f4-f092-4dfd-b4de-372fb13403c6/themes_in_act_1_scene_4_romeo_and_juliet.pdf
    • http://niwomif.pbworks.com/f/what_is_kundalini_awakening_process.pdf
    • http://fixiguru.pbworks.com/w/file/fetch/144565293/soul_knight_secret_button.pdf
    • https://uploads.strikinglycdn.com/files/b3ac6542-c702-495b-9922-df77e1b18a1e/gugakagejaw.pdf
    • https://uploads.strikinglycdn.com/files/835992ae-5e2a-43c9-8785-51edfbf0031b/2000_kawasaki_mule_550_top_speed.pdf
    • http://junerew.pbworks.com/f/exemple_rsum_rapport_de_stage_free.pdf
    • http://wusagem.pbworks.com/f/sejepimatalivutuxum.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_off0000ea27.bin
39006b780902764c38f6008724cb68b641fe9cf1d8200e68feaee01b4648d62b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 6048 bytes
font_01_sfnt_off0000feb9.bin
01d124e957f6e2385b4f7aea826e79949054b98f9892e244a588be717a47edaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 11324 bytes

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