Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d959fc07236a507…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 14:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859fe9eb70e36b58b758c68a38f92b62 SHA-1: 10a89c1d3f85764f168e9e649b127baeeaff6dc9 SHA-256: 3d959fc07236a507d19a16c3eb07a8771e859b33731e87f4a95faf85eee8a679
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the document body and heuristics point towards a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=microsoft+office+word+2013+free+download+filehippo
    • http://jirenaxapibetig.scienceontheweb.net/suninu.pdf
    • http://kajipim.mypressonline.com/decision_tree_regressor_sklearn_parameters.pdf
    • http://xinupavob.iblogger.org/sufunupuwemusero.pdf
    • http://nuxuzuruguli.mypressonline.com/73947845149.pdf
    • http://energierecrute-emplois.com/9502916252b16tg.pdf
    • http://zebiripu.mygamesonline.org/boborofig.pdf
    • https://static.s123-cdn-static.com/uploads/4477400/normal_6000004526f05.pdf
    • http://tameeniraq.com/how_to_set_timer_on_cuisinart_slow_cooker22o5s.pdf
    • http://gramnews.xyz/can_you_sort_by_fill_color_in_excelq5o7x.pdf
    • http://lnstagramverifiedsbadgeforms.com/chinese_drama_ostewuk8.pdf
    • https://cdn-cms.f-static.net/uploads/4375507/normal_602e0d0735f81.pdf
    • http://mebel-albero.ru/81090724413n41zd.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_602d4827cf8c8.pdf
    • http://ibkreactiva2020.com/88545628080xyjjg.pdf
    • https://cdn-cms.f-static.net/uploads/4450883/normal_601f9f516aa27.pdf
    • http://vuwimoxit.mygamesonline.org/69620177105.pdf
    • http://fullhp.info/the_holy_science_free_downloadhg37e.pdf
    • https://cdn-cms.f-static.net/uploads/4427783/normal_60340e6497f95.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wodowepakimeko.onlinewebshop.net/vefobowawipojexag.pdf
    • http://luregaw.onlinewebshop.net/35124193938.pdf
    • http://mapelapelebiben.rf.gd/tolikupatapodoxanawavadep.pdf
    • http://rusozetowozo.epizy.com/types_of_phobia.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f037.bin
f5a6889c7e005ee179af69c3e00b6b142a3fa774906b111409b0ca2106582230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5832 bytes
font_01_sfnt_off0001042a.bin
b5ed3d78ab8883e2a75ebd3e009b3ef81c9be8f52d60fc14bec3272ec5d4c4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10572 bytes

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