Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e853ee1951fc0fb…

MALICIOUS

PDF

75.2 KB Created: 2021-03-27 23:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 726e8e52fe56c4e75462831e067d45ed SHA-1: 5054e7d16b9b6d748ee72b03ef56389e179738e0 SHA-256: 6e853ee1951fc0fbfb295cf256d459368eab1c1f554a7e41f0a577c992cc8fc0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://xezojetit.ru/wix?keyword=magnetism+and+electricity+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5ffdea6d00ac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ff0b5b1d16ad.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/hfgcNha/97651962126.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/djbhb4J/smash_colors_3d_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453718/normal_602a1ce0c50a5.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/chchiDO/jungle_adventure_3_hacked_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478378/normal_60010fbc10c48.pdfIn PDF document text
    • http://liseveziko.iblogger.org/what_are_the_3_types_of_mountain_building_processes.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxaletadi/ibUwhjf/have_a_snowball_fight_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481291/normal_60505021676b4.pdfIn PDF document text
    • http://murunabo.iblogger.org/avaloq_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_6014d553eeec1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5fe502119d016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_601109c4a4f98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_17ef830bf227484f8d41e799b906e1df.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_efe5d806ce984c469fd99e21159824e7.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_5561242edab5405295bb7eb2fff7aa66.pdf?index=trueIn PDF document text
    • http://tovumenigoge.rf.gd/90441527640.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 5832 bytes
SHA-256: 5b4d50960adafee0ab3eacf108e5b3d49358d64e3f1b0cf4f3bf2e36a63c28a6
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10412 bytes
SHA-256: 905356c798e7c4ed6a15164dea64f360bf65412ad556d165971a1a20cda96da3

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