Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93f658ba07e0dd6…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 03:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb3c97ddc6c9b1671509ee14ba0f1d9 SHA-1: 55784bc3da5421f73861ab4b1a81e613ed7129de SHA-256: f93f658ba07e0dd6ebe208506abc66151c73d964641efacd7cf26c8cc4672172
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with a primary focus on directing users to a collection of other PDF documents hosted on various domains. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these links rather than convey information directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/wix?keyword=immuderm+skin+cream+reviews
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/3372930.pdf
    • https://cdn.sqhk.co/nuzitomizaj/fvNjhib/lamofagevitewunefejerejug.pdf
    • https://cdn.sqhk.co/gasajolop/qicYjcy/rolling_sky_2019.pdf
    • https://cdn.sqhk.co/botonerepap/i8ggPjj/risk_analysis_tools_for_small_business.pdf
    • https://cdn.sqhk.co/nojedajoze/iem4Bji/sniper_legend_2016.pdf
    • https://cdn.sqhk.co/lafixafif/9jiYjdB/zupem.pdf
    • https://cdn.sqhk.co/sawitofi/ibgfChh/gewikajogelulafinesisu.pdf
    • https://wediwubogeken.weebly.com/uploads/1/3/2/6/132681674/924917.pdf
    • https://wefisejeradez.weebly.com/uploads/1/3/4/8/134886640/4508425.pdf
    • https://cdn.sqhk.co/vipujitebiki/vhajfgf/auto_clicker_ios_13_cydia.pdf
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/movabo_zarik.pdf
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/5cda8.pdf
    • https://winateminapalem.weebly.com/uploads/1/3/4/0/134041456/6560266.pdf
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/2543294.pdf
    • https://cdn.sqhk.co/kewusikata/jcViaSR/kit_chelsea_512x512_dream_league_soccer_2020.pdf
    • http://juborad.mywebcommunity.org/33479476420.pdf
    • https://kepubewi.weebly.com/uploads/1/3/6/0/136095452/8319823.pdf
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/9065504.pdf
    • http://mofobawosenej.mygamesonline.org/55090138355.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cbcaa938-7778-491b-8ae3-d922488f349f/mubijodusokodikiwodakujat.pdf
    • http://ludugatitabi.atwebpages.com/limekaretapapupakilina.pdf
    • https://uploads.strikinglycdn.com/files/55631bc7-496b-48a5-ac1a-328c3c0ba288/9407858758.pdf
    • https://uploads.strikinglycdn.com/files/196e5794-869f-4226-9a62-f26a44537a92/25555195027.pdf
    • https://uploads.strikinglycdn.com/files/db9d084d-60eb-4753-b233-985b869fbd7d/f_distribution_table_0.05.pdf
    • http://nejesezape.myartsonline.com/53934144430.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_off0000e6e7.bin
08f81669b24b37ea8713c7b0f37537d6d697ae50a2349a3b4340cd36f9be37c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 5204 bytes
font_01_sfnt_off0000f88e.bin
fafadf52bce8236c034e95e7d90fb5d1ea6412f048cf5a54038d6689a327062d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 2004 bytes
font_02_sfnt_off0001020b.bin
cf161465b59d2a8d6b14d0b646d16b16215b16b1f0084097b5bb215ac9e81f30
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 11116 bytes