Malicious PDF — malware analysis report

Static analysis result for SHA-256 38eb8782bcb1bd7c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-18 08:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1a2b6d88e733ada664081818fab2be SHA-1: 14d54e07139752e2185a3d6d332c365cc90a1b7d SHA-256: 38eb8782bcb1bd7c47a37a0641aa5712298b3c28f0c88e976ccc1b09741b0530
156 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 a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or content distribution network for malicious payloads. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a focus on directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=mighty+beanz+value
    • https://cdn.sqhk.co/tatolodam/igES8cD/forejinalutirak.pdf
    • https://cdn.sqhk.co/jokawefezo/mkjcRjc/high_school_escape_level_6_walkthrough.pdf
    • https://cdn.sqhk.co/gexedamej/VigwhhB/sago_mini_toolbox_youtube.pdf
    • https://cdn.sqhk.co/rosisole/Ojdjahb/tuwida.pdf
    • https://cdn.sqhk.co/rejoxapuzopa/PiiViay/bad_banker_jokes.pdf
    • https://cdn.sqhk.co/sepovili/iLgiSge/lafowadepitobibevoguxorig.pdf
    • https://cdn.sqhk.co/woledowo/mhbYjje/rexenevepap.pdf
    • http://usesoda.pro/zemebanarisoti3v65q.pdf
    • https://cdn.sqhk.co/fukonovum/hdWtdxd/vupetidinofiwomaxoluvape.pdf
    • http://wssummer.space/58293667795bb2eb.pdf
    • http://knitfqph.site/automatic_engineeringbg4fk.pdf
    • https://cdn.sqhk.co/pitekofotada/XjaVCEg/puzzle_levels_in_hero_wars.pdf
    • https://cdn.sqhk.co/tesikotuk/hhdgi4o/hempire_plant_growing_game_apk_mod.pdf
    • http://teasmall.space/sony_ht-ct770_remotez3w6u.pdf
    • https://cdn.sqhk.co/lunemitibojo/viabzhc/38686214279.pdf
    • http://energierecrute-emplois.com/42765384593fxb7b.pdf
    • https://cdn.sqhk.co/borefigux/csdjbSE/82168253525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_d5fe80dc05cc4311ace964f3ae845b9a.pdf?index=true
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_1fad5592cd884cddad555b2735c5c1d6.pdf?index=true
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_2bcf46cb8a0b4513a049ecded1c63526.pdf?index=true
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_fb53e19c96e04878967dbc3f0173325c.pdf?index=true
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_b5006e6df05847f98707d6bcd844546d.pdf?index=true
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_53d3ffdb56fe47f09cf29cc38ac9a099.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_032c35dab0d645bf803871bb27e7b6b3.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e111.bin
7a45424b5a4787f66c80e3d59fa02dd1993aec5ea3185d1e4a8acc5aeb63c559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 5032 bytes
font_01_sfnt_off0000f259.bin
d22c35b7a6fada84f657f30b419a1798c063a1e83cc83af9c1b823866818d859		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10584 bytes

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