Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e4089b1496a526…

MALICIOUS

PDF

72.0 KB Created: 2021-03-04 17:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c1dc996e3eb045791a14e62b60e99772 SHA-1: a176957db859e7e3bfffcb4ef199a125deb4a1ad SHA-256: 72e4089b1496a526bb4b80cd8008f425f929db0a01c906985ef375996edc9192
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'baarspo.ru' disguised as a search result for a calculator emulator. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

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://baarspo.ru/strik?utm_term=casio+fx+cg20+emulator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465393/normal_602addca60afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_6015fded00f3f.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ilhi2cz/rolling_stones_album_covers_1960s.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/jfDk1gd/jejajajolebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_602dfc513a416.pdfIn PDF document text
    • http://smartradiobf.ru/kenmore_mini_fridge_thermostat_replacement0i3hq.pdfIn PDF document text
    • http://dariduv.22web.org/zegedaninilomewobaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_600d4b76ae073.pdfIn PDF document text
    • http://rezltml.xyz/zonawimatamivezmdj2k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_5fed49799e83d.pdfIn PDF document text
    • http://losmopaka.site/how_to_lose_stomach_fat_while_weight_trainingyntk4.pdfIn PDF document text
    • http://javiwovaxaduza.22web.org/what_is_scarcity_in_economics_and_how_does_it_influence_choices.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_6000217322bfc.pdfIn PDF document text
    • http://aydym.club/rubuxuviwaruluxiraqaxtp.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
    • https://s3.amazonaws.com/sesafefanulokam/11275049432.pdfIn PDF document text
    • http://toramowajo.epizy.com/fintrac_guidelines_for_suspicious_transactions.pdfIn PDF document text
    • http://webukoxaxox.rf.gd/what_does_proverbs_30_5-6_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/mugubor.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_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 5340 bytes
SHA-256: 00d984b55638cacb184637eed426dffb4b98faf02d35fda92c2db04f70448502
font_01_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 10892 bytes
SHA-256: 74a9cb9712224213c663ad5bca2fefc792ca73da0acbf4593ba91960b47bff23
font_02_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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