Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd930a06d784555…

MALICIOUS

PDF

79.2 KB Created: 2021-04-03 19:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 46f65a2c62aec4de4dc5ea9bcda22ba3 SHA-1: c9e5f673e0527af1a16391b9f323aab3b650120e SHA-256: acd930a06d784555941b098e0a41fb33b2377bde537747f8d22c38e3b94504b5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which, 'https://jacksth.ru/strik?utm_term=why+won%2527t+my+rear+speakers+work+in+my+car', appears to be a redirector. The document body, though heavily obfuscated, suggests a lure related to car audio problems, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=why+won%2527t+my+rear+speakers+work+in+my+car PDF link annotation
    • http://update-win20.online/116603275xxbpy.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/25841382546.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/ijigjdD/disneyland_hotel_hong_kong_promotion.pdfIn PDF document text
    • https://cdn.sqhk.co/jawezumate/tbPjdgj/sevuwujazexexasiguzumofa.pdfIn PDF document text
    • http://p-kavkaza.ru/automotive_electrical_repair_manual1v76v.pdfIn PDF document text
    • http://kismykeitio.best/60494137796l9dzx.pdfIn PDF document text
    • http://dressnbuy.com/14420850897yhn6h.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/91336972301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0aa9ad9-d8bb-4630-a09a-1f665529f8ad/rorazapilegegomosoguv.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_7815eeac60004392be4b77d4e269c255.pdf?index=trueIn PDF document text
    • http://tiluxusimutine.atwebpages.com/hunter_pet_dps_classic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6d477f-d956-43b3-b1d2-db9ea12ae9cd/fl_studio_12_image_line_free.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_41e18afa0d1c420ca5d5d09d60aac522.pdf?index=trueIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_4ae96079f9c4486988755234b64e82a2.pdf?index=trueIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_c147d47c97114e88961beb675983af72.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_35da1c3776c04be39f85daafd0ee11b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e51ebc6-fc46-4985-9a0d-5b0d62eb6206/8.25_sales_tax_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5dea4ae-4aa4-4032-b8ee-c2ea0a52d3e3/online_trading_guide_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6e6a7c-b3b7-450e-8627-59b186f68c1c/furitojevene.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_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 5444 bytes
SHA-256: 9a54e1f2a2cdc69948d872efd70e0bd9c5316d41b5f4ead352c420aad6b7c4f0
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 10500 bytes
SHA-256: dc884c761cdf4f9bdf0026b961c0be0f193108150207e36c4bfcd9ae1632fa27

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