Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c22e7da4283637…

MALICIOUS

PDF

77.6 KB Created: 2021-03-10 11:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a141332fe4b0b7ca6c22564276b3a9d SHA-1: babd51ce1f3980a9b6dd8d1d625bcce7de8ebed4 SHA-256: b3c22e7da4283637a92d450de74ce86a5103295a93c666b906b4b153d88774c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically leading to a suspicious domain related to Cisco CCNA practice tests. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=cisco+ccna+200-301+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fe7789d48eb8.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/71917616270.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/97803147559.pdfIn PDF document text
    • http://bogplaktnc.fun/how_to_attract_money_joseph_murphyfar2i.pdfIn PDF document text
    • http://wbigs.space/11727054613q4lq8.pdfIn PDF document text
    • http://pc-remont.website/gefukozagibabulevocc9dg.pdfIn PDF document text
    • http://bejawutipage.mywebcommunity.org/37287894978.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/91111892167.pdfIn PDF document text
    • http://my-credit.info/discovery_bible_study_methodorpvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_601731d4f3fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471703/normal_5ffb7c780c7cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_5ff4a8d359011.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/activesheet._shapes._range_array_group_1._select.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopodisimedu.epizy.com/92164638721.pdfIn PDF document text
    • http://lepugip.epizy.com/4899586126.pdfIn PDF document text
    • http://pazepoxi.atwebpages.com/samsung_xpress_c480fw_toner_yellow.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/sony_dvd_player_dvp_sr210p_remote_code.pdfIn PDF document text
    • http://tixixomevupot.rf.gd/monitoring_evaluation_and_learning_tools.pdfIn PDF document text
    • http://xomesozumifa.rf.gd/52888858431.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 5320 bytes
SHA-256: c0226545d214a1377e6ee357a96186515b26d432ea429bdda70fb38d9e51e5af
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10580 bytes
SHA-256: f19e397217603fdf2f2421d80f83934b74d7bf2805a31ba7e971d2452dbe6846

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