Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42b748eb7937639…

MALICIOUS

PDF

75.8 KB Created: 2021-04-09 00:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8f8447094441a6c2d3c36014b7a8f4df SHA-1: bdd6ca77d62f3b3960f233188c99048b185e61aa SHA-256: b42b748eb7937639fb6a014a740590a25fb08eb448a09f19d8aab1bbe2b76787
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'jottigo.ru' which is associated with a redirector, and another to 'help-business-media.com'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=beautiful+creatures+series+ending PDF link annotation
    • http://help-business-media.com/codehs_ap_java_answersbezlx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_5ff0d7e6c5409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426418/normal_600639d0ba6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd62143d1220.pdfIn PDF document text
    • http://eslife.pro/arifureta_light_novel_volume_30b0wf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_600f53e814c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_6029a800afcd5.pdfIn PDF document text
    • http://romeita.space/wot_best_heavy_linebu2m0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ffb54c0e4a47.pdfIn PDF document text
    • http://new-leggins.site/492068186kz6v4.pdfIn PDF document text
    • http://getsol.xyz/julius_caesar_play_cast_listq2a6d.pdfIn PDF document text
    • http://iranianvc.com/music_video_app_on_rokurliah.pdfIn PDF document text
    • http://jushq.pro/rejozusebarebewaf4vdrn.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/605e6b51-13ef-4bba-9c01-a20d17d61b0d/what_role_did_america_play_in_world_war_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44f17d2-f561-40dc-8a4d-73c73ac44e5a/how_to_succeed_in_college_algebra.pdfIn PDF document text
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_cfcac830cd28478cb9a72f018b75b571.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_a4c8de1e975949d08edccfc0cf551a83.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_02d457c1547d4142a3ec5147c7fe51a4.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_4aae9d8930ad4a2f9cfaa984556a0711.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c418854-1588-48db-9d3d-6b99f350ffa1/2450747661.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_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 5240 bytes
SHA-256: a34683cd330cb143090cc2db7c978e4eda48620d2cf77ef5fae733998cb7c58c
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10316 bytes
SHA-256: d2b3eae485e7fcef89704e2961733518327502c27d4c82849087ef03affccca1

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