Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bffd2997064928…

MALICIOUS

PDF

67.4 KB Created: 2021-04-03 16:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a01ad31a54219f043b02072c045e8654 SHA-1: 7fd33bb8a7d34eca9c596f7f4f2cfd4d497ba63f SHA-256: 58bffd2997064928b852c6ec33b2023c0def8ebbbe47af94f647b0af031c0ec2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be related to 'Cambridge English Business Preliminary PDF', likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=cambridge+english+business+preliminary+pdf PDF link annotation
    • http://carluxepaint.site/gubivutut7z6pb.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/tenijowizuw_lanafel_dumapog_xijaxudikug.pdfIn PDF document text
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/8122079.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/gTohaji/solar_system_definition_quizlet.pdfIn PDF document text
    • http://vengriya.space/jozuleveroviripubopanoxoyh8hi.pdfIn PDF document text
    • http://littlenat.space/colleges_with_good_english_programs_near_mecpg6r.pdfIn PDF document text
    • http://winoorama.site/linalajomorilafo0m8qu.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/7724397.pdfIn PDF document text
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/237366.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/29b51d95d4fecc.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/a4jgKJS/guess_the_hollywood_celebrity_and_earnest_money.pdfIn PDF document text
    • http://setofexperience.site/garmin_rino_650_batteryystpn.pdfIn PDF document text
    • https://levubitadogu.weebly.com/uploads/1/3/4/7/134727965/d3f803ad7.pdfIn PDF document text
    • http://gamedv.design/7112422994834qh7.pdfIn PDF document text
    • http://uscreditmonitoring.info/pl_sql_interview_questions_for_fresherswgk8s.pdfIn PDF document text
    • https://shop.swiss-exams.ch/produIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://metoxitaneg.epizy.com/76592716698.pdfIn PDF document text
    • http://dewutawezidu.rf.gd/jimmy_carter_hair_part.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_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 5600 bytes
SHA-256: c2e51c19704acc3f7eaacce62afc467f3ca508459d685ef350a82eb62edcda08
font_01_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 10128 bytes
SHA-256: 869d9be50de0025c99369fbdca19c439ef3f252eca01e3b1b7fdc6d5f07ca2ef

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