Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5299b176060699…

MALICIOUS

PDF

77.9 KB Created: 2021-05-04 05:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1a09f2dc45655be3f35ea17069bd75 SHA-1: e0506efffab0ea5af442e4cac8ab2a24387fe57e SHA-256: bd5299b17606069903d8cd7fe9952e6d15e7a46f9f07c5d15bd79d9229ce7760
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are likely part of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though partially corrupted, contains a URL related to pairing wireless headphones, suggesting a lure to a deceptive website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=how+to+pair+beats+studio+1+wireless
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5fe1656eaba12.pdf
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/a0e13824d0b8.pdf
    • https://cdn.sqhk.co/papusabefo/gdOihL6/lego_marvel_super_heroes_2_walkthrough_part_5.pdf
    • https://cdn.sqhk.co/liminekaj/hgdFgjh/hitman_goty_upgrade_ps4.pdf
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/29774c3d.pdf
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe9b8ed182d1.pdf
    • https://static.s123-cdn-static.com/uploads/4375340/normal_60048fc93a0d5.pdf
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fccc0a81e55d.pdf
    • https://static.s123-cdn-static.com/uploads/4456705/normal_5fc8691911066.pdf
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff85688f07f2.pdf
    • https://cdn.sqhk.co/bebomopakax/o6ic4FZ/fezivinegobitawonuxa.pdf
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5feb040713c38.pdf
    • https://cdn-cms.f-static.net/uploads/4388620/normal_60657b42d8150.pdf
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fe729c18ba50.pdf
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdf
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe2a6abce869.pdf
    • https://cdn-cms.f-static.net/uploads/4481275/normal_60159aba9cb19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bejexe/mainstays_metal_arm_futon_instruction_manual.pdf
    • https://s3.amazonaws.com/zusevamasor/crafting_guide_terraria_mod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e770.bin
54f21a50a365fd17476f1821fb2b075c192c496f3838389c19892ddc69a662bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 4972 bytes
font_01_sfnt_off0000f870.bin
25ec20fd9c459df42a61e3d380d2e9755dc95c3b9e100b334654489be0e277eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10316 bytes
font_02_sfnt_off00011bea.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 4324 bytes

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