Malicious PDF — malware analysis report

Static analysis result for SHA-256 bada38cee36d7918…

MALICIOUS

PDF

98.1 KB Created: 2021-03-30 03:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6dd0691e51f20fcc9e600133ebddfa03 SHA-1: bdbf548b03e6d080286f3352d2e2836dbd2c8725 SHA-256: bada38cee36d79180bd2573ea79cd9468d0ed87a5bf216da665c9a8523d6f9b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=copperplate+handwriting+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6032e273d692f.pdfIn PDF document text
    • https://cdn.sqhk.co/nawafoxobok/hibPnR8/17436757230.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/aTidWAs/feed_the_zombie_game_online.pdfIn PDF document text
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/5048782.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/wukufu_vobivijimaked.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/hdidOid/defense_zone_3_mod_apk_unlimited_money.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/fagapan-reridonaxu-sejapeli-tinezitujupelog.pdfIn PDF document text
    • http://movoxazukum.22web.org/eagles_injury_report_for_week_5.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/hiGs6ia/the_hangover_movie_soundtrack.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/betaflight_configurator_3._2._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_606161f57c851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea23bd0-0bf7-4743-abca-20757ef7f6a2/how_much_does_a_full_makeup_kit_cost.pdfIn PDF document text
    • http://jolafefiluw.rf.gd/907119971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1db3f8a-51f4-47b7-8ad9-b29ad31c83a4/23951609420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00ba8ef-dddc-499d-9cbe-b9140d168cf7/wipuxiloziwujibasalekidag.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_off0001422e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422E 5280 bytes
SHA-256: 3dfe86d0955dd1f5c4a2a20b575539159fb5751937f1094f446a220d7fc41ec4
font_01_sfnt_off00015427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15427 11120 bytes
SHA-256: 1e90d316d9f1e38dd85e72e5325075b2b462ec948e4e9497c5034b2387b988e7

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