Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58976edb82c1939…

MALICIOUS

PDF

117.6 KB Created: 2021-03-15 18:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4fcf5a19078b797129971b354ec11a72 SHA-1: 690a81c44a3a5321c9f066d1aed8acdf8392b6ca SHA-256: f58976edb82c1939128329a6b75d7ba27e89a0f64801eaa44cc60a74d88e39be
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://resalured.ru/wix?keyword=lg+g+stylo+user+guide' is likely part of a phishing lure, masquerading as a user guide to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/wix?keyword=lg+g+stylo+user+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497372/normal_602105d548a3b.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/zvgdTih/caldera_baxi_main_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/hEXgffZ/expansion_slots_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/gBjfNhi/manijitisenikanebamegutes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5feb5e4baf4a8.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/GW8idjf/gafudawoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/jjcE7ia/32852099699.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/ibgfQnG/vumatinemekij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_601d36741b57c.pdfIn PDF document text
    • https://cdn.sqhk.co/dixazotunu/gf6Tgdz/flame_tests_for_metals_lab_answers.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_bf6eb8f830dd423cbe06dd301f8e3101.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da354e4-0df3-4729-9ab1-cecad53b5dac/sony_ps-lx300usb_turntable_with_diamond_stylus_and_usb_connection_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f301698-49d7-41cd-94df-b3d6a5d61073/91945320563.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_55e4daebb2184dfe9f9e185573883bfa.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_e658339968e84f6da65c4fc5472736a7.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_3b460d9251574e5796e5d8ba4eda5fe0.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_c9be9024a7b6490590f7b5a0bc05de1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/730921ed-4d00-4119-b798-ba18828ead47/sapeviziguxusifit.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_de181a08a10c4a6d88a1846b490c8687.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_449f6dd245244a349e9a9a1848398a9a.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16544 3724 bytes
SHA-256: ce22c8eaa1f53a77d563481fc3f0abc202627ce0e69ac912df19b60822d178aa
font_01_sfnt_off00017271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17271 2112 bytes
SHA-256: 55ce8fbca5928ff5e24b10be2eb584b493b72b29c72c7f70db3a1dd13cf92d6d
font_02_sfnt_off00017bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF9 4604 bytes
SHA-256: fce575c7fe60ce36090144d66567dde6255a98db01ff222bac63e792d023f8ec
font_03_sfnt_off00018bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BBC 14596 bytes
SHA-256: 42ead82c7c8e690cd08334e1b7e0b1d52907d7cf994e0b646f77ef6db924370e
font_04_sfnt_off0001b9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9E1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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