Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6119483412b94a…

MALICIOUS

PDF

94.4 KB Created: 2021-04-04 17:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b8bfe87bf01214b9b94837deed437208 SHA-1: 0b4d864185a5209f035002a1b74b1961d38baa83 SHA-256: ef6119483412b94a34a92c3b0eaf6d1a9628f4df57c657fce5310fbaeb76728f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to Craigslist and motorcycle searches, suggesting a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=craigslist+bangkok+motorcycle PDF link annotation
    • https://cdn.sqhk.co/toxotunem/chhyuha/50803046110.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/sufilapiz.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/jccqOF5/dominos_near_me_delivery_phone_number_please.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/la_ciudad_vista_beatriz_sarlo.pdfIn PDF document text
    • http://perinolaguzur.iblogger.org/21973346168.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/dugex.pdfIn PDF document text
    • http://sofoviwov.iblogger.org/98759480592.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/current_news_article_review_worksheet5fipq.pdfIn PDF document text
    • http://snapchat-alert.com/xujugawakimapojixanui22k6.pdfIn PDF document text
    • http://epipog.com/sofezabiruxubzmrvw.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/kudizima.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/gojetegakerim.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/h0pq5hc/mower_blade_hits_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/3sRiaji/56812423348.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/bB2Mibd/kanto_power_collection_box_release_date.pdfIn PDF document text
    • https://pejadalat.weebly.com/uploads/1/3/0/7/130775017/xexevivatetabisuj.pdfIn PDF document text
    • http://kexumojazo.mypressonline.com/applied_spectroscopy_and_the_science_of_nanomaterials.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/tiniretejola.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/reading_comprehension_grade_10.pdfIn PDF document text
    • http://gedonisezif.epizy.com/japanese_futon_bed_sheets.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_off000133a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 5328 bytes
SHA-256: 82b3af92fbf4438c326f63f3c5461fc512a649fea9a5bc670d8e7e33a6017407
font_01_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 11436 bytes
SHA-256: 01a6892f7c1d135e2e20121ac2f264b39c987a85cf4365627616a974de2e2fdb

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