Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b29ce7f26d61b6…

MALICIOUS

PDF

75.1 KB Created: 2021-04-06 14:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 651351637ace08869603113c2a8647eb SHA-1: b7b3ba1c592e011d312a9452b80538cbea77a298 SHA-256: 22b29ce7f26d61b6afdea69035bdc71794544a0e97588e0aea28d867d927ec59
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to disguise malicious links within a large number of seemingly unrelated documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=pip+application+form++pdf+2019 PDF link annotation
    • http://disconto50.pro/python_http_basic_auth_requestv0yp6.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/juhchiT/what_does_toggle_on_mean.pdfIn PDF document text
    • http://irisca.online/50535647650nxqcq.pdfIn PDF document text
    • http://hydrofthol.space/398022172403nvk1.pdfIn PDF document text
    • http://geleostone.online/738122026q8liw.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/Yc4Ur7P/train_controller_jobs_london.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/basics_of_electronics_engineering_ktu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovisak/af_semi_formal_afi.pdfIn PDF document text
    • http://wetafemef.epizy.com/collateral_warranty_jct.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/why_power_is_important_in_politics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6b999e-edb8-4636-a315-556ce789c5de/how_to_study_physics_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928804f4-1a1f-4c0b-aadc-0b04a9328342/62747234478.pdfIn PDF document text
    • http://watusinujebisu.rf.gd/vaferajomunor.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/43197169735.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/zufamababiroxesuv.pdfIn PDF document text
    • http://xazopab.epizy.com/gate_2018_answer_key_made_easy_mechanical.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/trevor_noah_born_a_crime_summary_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/indented_business_letter_template.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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 5608 bytes
SHA-256: 16fb5ebe2b682c7339bca086a4caf96107693bf28398ed390dc9ec55eccb4bd8
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10956 bytes
SHA-256: 8bc0bc18c71453fa449a151d7e3fbafc2b8e5c3e3d0c2d96240a41cd9647cd38

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