Malicious PDF — malware analysis report

Static analysis result for SHA-256 1103b4a7f57e58f8…

MALICIOUS

PDF

115.0 KB Created: 2021-02-20 02:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e30c2ae4ef0d84c172a375fe232bbd51 SHA-1: bab802ab67fd5684fa28f2cb16063f4d384d00fa SHA-256: 1103b4a7f57e58f84fe5e3c86db0769b3b6df01ae585be5be8f1f1005f9306c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=arduino+uno+pin+diagram+wikipedia PDF link annotation
    • https://cdn.sqhk.co/jeporikate/0ihdShc/convergent_evolution_definition_science.pdfIn PDF document text
    • http://trudogoliya.online/nedadixado4ewen.pdfIn PDF document text
    • http://reduslim-ordina.site/32328779815s9qzc.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/btOKif0/evowars._io_hack_b_t_t_pc.pdfIn PDF document text
    • http://opsnatur.fun/soxinonomivi2vmaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/hmjj0jd/jamepofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483336/normal_5feb68f298419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421629/normal_600930044d8d2.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/a7RhizY/thomas_and_friends_railway_adventures_pc_game.pdfIn PDF document text
    • http://popapirim.22web.org/pathfinder_kingmaker_companions_classes.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/hhajiic/timokodalagokifakejen.pdfIn PDF document text
    • http://stroymarketmetal.ru/34187867190tofii.pdfIn PDF document text
    • http://mugatazujiririv.iblogger.org/68706434039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_6004d374d81ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fc5e8e623e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_600a14079a000.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/Tge1ji2/41634363112.pdfIn 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
    • http://pesaforasipu.epizy.com/dosidibaxofiz.pdfIn PDF document text
    • http://fobexegedun.epizy.com/1815599841.pdfIn PDF document text
    • http://vanabigura.rf.gd/odia_new_song_atoz_2018.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E9 4280 bytes
SHA-256: 5331bbf8802f4e81f5a4d15af8868ae6b5cef681da4b65a9ac8dae2a4ab8d53e
font_01_sfnt_off000172e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E8 5016 bytes
SHA-256: 6c4fcfcdedfb20977bb41f2d6115c3a86bfa4d81f89bac9359b1b1b081873fd2
font_02_sfnt_off000183e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E4 13604 bytes
SHA-256: dcaddf97aa6802f484d636334fb5189500a9327f84decb96144defd2e54d2397
font_03_sfnt_off0001affc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFFC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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