Malicious PDF — malware analysis report

Static analysis result for SHA-256 d009a27b2cfd924f…

MALICIOUS

PDF

79.4 KB Created: 2021-05-06 10:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d3944a1b63be99b21b4f455129bb14c7 SHA-1: 96c7f0c86713a1f369b2ce09dc15a116b1061afd SHA-256: d009a27b2cfd924f9d8089c6533da728ddfd6c2bd194bc097b85ad39d72ed553
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs, with a prominent one being `https://maypoin.ru/strik?utm_term=firex+smoke+detector+troubleshooting`, suggesting a lure related to fire alarm troubleshooting to redirect users to a malicious site. The document body is heavily obfuscated, but the presence of external links and the heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://maypoin.ru/strik?utm_term=firex+smoke+detector+troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450898/normal_60177c9be893a.pdfIn PDF document text
    • http://miwuzobi.sportsontheweb.net/zegavikupemukawuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5ff520cc5b084.pdfIn PDF document text
    • http://letgtma.bid/craftsman_lt1000_original_pricegruzk.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/rikazawoleketekejasodufob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_60355d437898d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_602c9e28c3f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_606472ff2208e.pdfIn PDF document text
    • http://jupizuginilumop.22web.org/moziveboli.pdfIn PDF document text
    • http://remontnatali.ru/knot_tying_for_surf_fishing9y80e.pdfIn PDF document text
    • http://aycotoro7.xyz/12690790482k8gyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_927a96b744864759b83ad645fe4bb931.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_fd39e9ae272c4cc394f2ba301411037f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/bmw_road_map_europe_premium_2017-_2.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/civilization_iv_beyond_the_sword_strategy_guide.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_15b25587e8894408a0013b3015befcec.pdf?index=trueIn PDF document text
    • http://miganuvag.myartsonline.com/rujizejakufavigi.pdfIn PDF document text
    • http://buzetewad.rf.gd/wafirotadeke.pdfIn PDF document text
    • http://balesalefune.epizy.com/character_certificate_in_english.pdfIn PDF document text
    • http://kejidexod.epizy.com/jamixokivavipapi.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/16253837581.pdfIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_eff3174fbd6d478ca5fd05292b6a124a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/biwetemimitofozosiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/fitbit_versa_lite_apple_compatible.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_8bdf36234c7e4943b9641d6514f90902.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 5252 bytes
SHA-256: aaf562ab6a0c54f2c60ad01828b3636365e11c32f9b79d41b1f3c2b5ee9b96a2
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 10192 bytes
SHA-256: 52372e626a0e822636db19a2f2d9020b149ce60eb3970fa2e0a6d0cd0d158241
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3