Malicious PDF — malware analysis report

Static analysis result for SHA-256 f585f938935896b5…

MALICIOUS

PDF

127.9 KB Created: 2021-05-13 09:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: df3c9e771d5f67a3d22a12b18d2aa278 SHA-1: db6fb19a01b52e6783c24a859a84df2888a48bf4 SHA-256: f585f938935896b5a05058ff2f8f530477eb799480ab942e57fbe71c107ad9d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 payload. It contains numerous embedded URLs, with a primary suspicious URL being https://dafemum.ru/strik?utm_term=what+is+auditory+processing+disorder+uk, which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'auditory processing disorder uk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=what+is+auditory+processing+disorder+uk PDF link annotation
    • https://cdn.sqhk.co/safubuguva/jahcugc/77823023579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_606ac10aa0104.pdfIn PDF document text
    • http://rmk4sale.xyz/wexosukodorajzzt0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_6055c0a059223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_600ec0b067fb7.pdfIn PDF document text
    • http://salonvarna.com/dashiell_quinn_smithfc924.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/jeAWXhb/turquoise_blue_diamond_glitter_live_wallpaper.pdfIn PDF document text
    • http://organicnu.info/sowekokakeindx1.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/1uig3ia/48539818444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_601a8204dd0de.pdfIn PDF document text
    • http://pitushok.fun/66165041517ctxix.pdfIn PDF document text
    • http://varnisvakq.ru/mini_games_new_arcade_apkj5raq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_d1917b12a11340758f2e07da3117b6d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/35985239425.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_3184e3c5319e4bdcb5f76009e184e61c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/ariens_st824_carb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b03d98-4a08-42b9-bf8b-72bc1718eb87/94701647581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b6aff3-1c25-4335-ae9d-905e4dc91881/netgear_powerline_av500_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60205a53-a7cf-4aad-ab09-2f4cd60fde52/killing_floor_2_weapons_skins.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_off0001b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B362 5484 bytes
SHA-256: 81b2bbf2624db5028c2f4bc7c145c80b5e33c5dd15ec6cf78d5966f7afcfe9a1
font_01_sfnt_off0001c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C617 13228 bytes
SHA-256: d6b7dc9db6e9cbd50233d3bfedb375b5c8cffdb69cb35e4766bd4a0edb173dbf

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