Malicious PDF — malware analysis report

Static analysis result for SHA-256 8610658ade445dcf…

MALICIOUS

PDF

73.1 KB Created: 2021-04-17 23:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3af9ddbee22d8f1374e83871fd8891f2 SHA-1: 51ba6d6acba20eb31d4e65e505f4837fbb02321b SHA-256: 8610658ade445dcf38d249b9ad3abfc168f02fe595a6247a3a52fdd3ca2ea9f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of links. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

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://ponafet.ru/strik?utm_term=books+of+the+bible+kjv+list PDF link annotation
    • https://cdn.sqhk.co/putuziboki/gqbcBqp/top_10_of_everything_2020_book.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/UHqoTjj/grumpy_cat_weather_memes.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/peziwopibaxozugajoxunawig.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/jia3ehi/ninilowagiku.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/ballistic_missile_defence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_601305035ef48.pdfIn PDF document text
    • https://cdn.sqhk.co/bobofibu/gdhb98j/38426917705.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/D3ISKgj/9501713061.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/bbBbhjQ/41180354873.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/Yih6HHm/33109109731.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/jeihiaQ/8067603720.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/setikizo/21053778356.pdfIn PDF document text
    • http://dasupepu.epizy.com/lirewituton.pdfIn PDF document text
    • http://titudisejofixu.epizy.com/ley_seca_sinaloa_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/88020964570.pdfIn PDF document text
    • http://xegiseko.epizy.com/tratamento_alopecia_areata.pdfIn PDF document text
    • http://wenares.myartsonline.com/sister_outsider_audre_lorde.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/excel_gantt_chart_template_remove_weekends.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_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 4940 bytes
SHA-256: 4870450885de29d6179842832e0e7dce43a6490e76b62c6231879f814487bbeb
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 10972 bytes
SHA-256: 712354e63c917c0a9b3c8b61b3d1d07f9c7c3ba18963ff1609a3c04001334d0b

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