Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2ac8b355d6c785…

MALICIOUS

PDF

76.4 KB Created: 2021-03-04 06:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22515241b7923a066e88223139dd3837 SHA-1: 2d453b1b381329788db3160965cb0ff41ab8161c SHA-256: 1a2ac8b355d6c785338cdbe532b8ada4fe316744cc093b04257c45ca241b9ce4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to redirect users to potentially harmful sites for downloading further malware. The ML classifier and ClamAV detection strongly support this assessment, classifying the file as malicious phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=vampire+diaries+damon+and+elena+break+up+scene PDF link annotation
    • http://bettyloustintruckbbq.com/rudavifoxakel7m0ea.pdfIn PDF document text
    • http://classicalnaturally.com/certificado_medico_gratuito_boliviaopxti.pdfIn PDF document text
    • http://nudistoff.club/373291382212l7i9.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/72JJEhb/crazy_true_crime_stories_podcast.pdfIn PDF document text
    • http://sandiego-podcasts.com/best_bible_story_book_for_preschoolersiqzup.pdfIn PDF document text
    • http://iblack.space/fiscal_policy_and_monetary_policy_worksheet8ivo3.pdfIn PDF document text
    • http://cosmosqrab.online/34622433236q35ww.pdfIn PDF document text
    • http://stopnutristrike.ru/build_a_simple_android_app_with_javaoegfw.pdfIn PDF document text
    • http://webmastervlad.ru/russian_alphabet_pronunciation_guideahz8k.pdfIn PDF document text
    • http://raifaisentapp.online/83250342562gj6xz.pdfIn PDF document text
    • http://legalvictory.group/52502500192mqez3.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/fhW2qsB/free_ringtones_2020_app.pdfIn PDF document text
    • http://1gusevshop.space/wajezipudoneo92dq.pdfIn PDF document text
    • http://zahlungsservice-ch.site/zufubawumuzth1ov.pdfIn PDF document text
    • http://clebohets.xyz/87958154822ycg71.pdfIn PDF document text
    • http://slmit.fun/doodle_mafia_answersws8r9.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8hwPiZr/vupabeveketoxedoxoposewa.pdfIn PDF document text
    • http://all-system7.work/cyber_security_incident_reporting_rbiezbmc.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/eiajcq6/spider-_man_rope_hero_games.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/zuguvoxoki/fairy_tales_lice_goodbye_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/zikufetezoniwirelojulis.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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5388 bytes
SHA-256: 0358639e467e1533e4a73c503731171d3a023bf80b32098c8c99d4f5f0378e83
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10440 bytes
SHA-256: 5c8159d0b8dd6f314da34ec4f8f7dda6c292e1c1df66363e14594ea7c53b8afa

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