Malicious PDF — malware analysis report

Static analysis result for SHA-256 930f2deb25ab3f88…

MALICIOUS

PDF

91.0 KB Created: 2021-05-25 04:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 543304df97d03cd7167096003a6cc5d3 SHA-1: 732591d66cbf3982e33d4d192aba56aaaff7db58 SHA-256: 930f2deb25ab3f88b6bf15783018bd3d2086b6728dd282bb65d91209e47dfe81
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 0.9997

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://xajibur.ru/strik?utm_term=ejercicios+resueltos+de+distribucion+t+student PDF link annotation
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/goloragino.pdfIn PDF document text
    • https://kidiveguworuriw.weebly.com/uploads/1/3/4/6/134677920/1936970.pdfIn PDF document text
    • https://wasexakenisopi.weebly.com/uploads/1/3/5/9/135982815/laper.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/3731150.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/6894053.pdfIn PDF document text
    • https://vefajuvajodal.weebly.com/uploads/1/3/6/0/136094574/2254039.pdfIn PDF document text
    • https://nefixesuxu.weebly.com/uploads/1/3/0/9/130969456/7b8601.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/wemirepuxakip.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/rogegogorutapotep.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/87277da30a82b.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/8739695.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/5212d.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/vinasuvonavofig-palajeva-duwige.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/ee7af8dc-b92c-4893-b361-db95e5222ab4/33018926595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d97427-881f-4275-9061-cd68116fb1f3/vapereturikumabemonelu.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/19892829088.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/40529978337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a59b3ff-58af-4ee0-94e7-ee7e8b3f72c8/htc_one_m8_camera_review.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/percy_jackson_son_of_the_river_styx_fanfiction.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/what_kind_of_usb_cable_for_xbox_one_controller.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_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 4896 bytes
SHA-256: 6c2ae3a6a4ae5ceccba73d5086ab164ed7643f03ca934fb6cb827854dcf32b3e
font_01_sfnt_off0001330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 12796 bytes
SHA-256: ae06a1821a348b40931a70159fe6a4acc07a2526560ef5be4ca6bcef731adb05

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