Malicious PDF — malware analysis report

Static analysis result for SHA-256 b693fbd521f7a606…

MALICIOUS

PDF

72.7 KB Created: 2021-02-20 14:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 621fde0270349935349163656a52f226 SHA-1: 7c10d96f30ff262a25eb6f142b3955071c5bcfe0 SHA-256: b693fbd521f7a6067b560c9c2a44a4f24a6297f43ad7f68599e25e2c47111f23
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Chick fil a job applications pdf', indicating a phishing attempt to trick users into clicking malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=chick+fil+a+job+applications+pdf In PDF document text
    • http://pipazodonuwadu.iblogger.org/nepit.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/MKyghjg/73085044899.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/6582796.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/patoge.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/pabunami_viruremosixeve_wavasukurax_kibasirutota.pdfIn PDF document text
    • https://soletobapikod.weebly.com/uploads/1/3/4/5/134582957/zupopazikejuzazoxepa.pdfIn PDF document text
    • http://hayatevesigar.online/96462363307gxdnd.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/Yhjjihe/fc_bayern_munich_store.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/enwheje/automaton_definition_law.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/QDZhagi/animated_movie_maker_online_free_no_download.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/vutowa.pdfIn PDF document text
    • http://pro-konditer.com/cuntos_mililitros_hay_en_un_centmetro2gd3g.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/hgexRib/battle_at_the_lake_seattle.pdfIn PDF document text
    • http://monongzhlh.space/distributing_and_combining_like_terms_worksheets6otno.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/chahh8J/drum_pads_beat_maker_go_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/rIqjdge/pewdiepie_age_of_empires.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevoxino.epizy.com/dungeon_crawl_stone_soup_build_guide.pdfIn PDF document text
    • http://xafopomafox.rf.gd/cough_sound_effect_free.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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 5332 bytes
SHA-256: 0e5ab692592ee030fa2951bc087b40c972bf266a5e602b8cbf453290290b463b
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 10428 bytes
SHA-256: fc0502f5e56303d52b24cb9b97b59d5f73c799e9192db92d06a281664e1f07e0

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