Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bf4bb29beb71ce…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 01:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3093f079f4dfc0fed3c9b2ef38919011 SHA-1: 8561ba628b543d4a138868b6b9eea8b78bc9be95 SHA-256: 77bf4bb29beb71ce8466d75499f443e4a5b1171626d1e2a8d82dbed5dce191cd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/wix?keyword=verbs+that+start+with+a+p PDF link annotation
    • http://my-favshopf.online/9545138551zqqt1.pdfIn PDF document text
    • http://geosen.net/15169297631waa80.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/PmicpdN/heavy_bus_simulator_pc_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/dhejihj/goxotenafefafokez.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/YjisSib/98909629890.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/79741921118.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/munukaxapul.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/dNgfCnP/knights_dragons_action_rpg.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/axis_allies_d_day_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_921a8fbbdf8747829616266ee8249c77.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_b3cc7923e9cc432cad5493d2ffe9dcf7.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_271c265c4a4149c1932f5586288e2b59.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_6afe2ea86be24c1489d6873d0cc3c1af.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_0674116a833946cf857c703a62d1e21c.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_444347935a5f4eeca152c1f1b98da98d.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_3db7a6f4771e40268d68073a71f5ee03.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_b9b5f00892774b399cb1075b83fa7180.pdf?index=trueIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_356d0b472eb141b286e9b2ed095e1300.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_34380135ffd945bdae67aa9e42c9d5e9.pdf?index=trueIn PDF document text
    • http://nedizilunok.myartsonline.com/how_to_balance_a_top_load_washing_machine.pdfIn PDF document text
    • http://zuputes.atwebpages.com/vegetarian_keto_diet_food_list.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 5072 bytes
SHA-256: a18909c8483032f40cca86faae7fb683ee23c88637f6fdaf3ad2a55c2cc9f8bc
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 9884 bytes
SHA-256: bb4f71cf5d409c4e51c9b0c309879f9766f2d4056ae652d94c9739e37b696416