Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a16c4b1e6db687…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 17:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 03195a5adfb220ed3a28154cfbec1f52 SHA-1: da751dc4940f6ba9e58f54dd451836d390c95cd4 SHA-256: c7a16c4b1e6db6877195438bcffd0a778e3762158adce30ffbacb457ff6ed5a3
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or phishing operation. The document body, though heavily corrupted, contains fragments related to 'trading guide' and 'wkhtmltopdf', aligning with the heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure strongly suggest it's used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=rl+trading+guide PDF link annotation
    • http://beririka.scienceontheweb.net/63108212967.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/the_little_sas_book_6th_edition.pdfIn PDF document text
    • http://xtreme-sport.ru/how_do_you_reset_a_ge_front_load_washermhuh0.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/44751646452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_60052a032db0f.pdfIn PDF document text
    • http://triple-doska3.club/a_guide_to_modern_econometrics22idx.pdfIn PDF document text
    • http://doruguduku.iblogger.org/lasetifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_602acde09c1b7.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/96608598721.pdfIn PDF document text
    • http://copyright-infringement.business/pozuwbkkom.pdfIn PDF document text
    • http://wersita.fun/zavowewuzasw7j3.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://firuxafuxu.rf.gd/xisewali.pdfIn PDF document text
    • http://lasakarafivof.epizy.com/fabotolarorefuzadav.pdfIn PDF document text
    • http://jefepar.rf.gd/43715280621.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/grade_7_math_pretest.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 4592 bytes
SHA-256: e18979e4b859079281c35735e22df85cb11122912e1af82888635d4216f237de
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 10348 bytes
SHA-256: 01097237ed311818fdfd7afc2f406bab7e9dbf82084bc5de8ed17dbaa7aab1c0
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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