Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9122703902cec24…

MALICIOUS

PDF

90.7 KB Created: 2021-03-08 01:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ff68c378fcebaa5f7b8594ef80c2be3 SHA-1: 43f3bf7c0fd702d63b13656fa6e63c911e2cf2d0 SHA-256: b9122703902cec24f4ab315e0b571f77a2315b2dac8255a7234a3f88f0ce9cb4
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for SEO manipulation or distributing malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, although the document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/award?keyword=ap+english+language+and+composition+2020+exam PDF link annotation
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/50e7207d1d4.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/what_are_the_12_steps_for_alcoholics_anonymous.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/872181.pdfIn PDF document text
    • http://ru-payment.casa/466047008096ewzp.pdfIn PDF document text
    • http://digitalmedialit.com/74933253500w4zvk.pdfIn PDF document text
    • http://denizan.com/mens_haircut_fade_or_taperp0jnv.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/how_much_is_the_deadpool_suit_worth.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/bilan.pdfIn PDF document text
    • http://mp4.design/96582091475akft4.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/720790.pdfIn PDF document text
    • http://tryraisins.pro/xuzodopamobed28j.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/matozekafowo.pdfIn PDF document text
    • http://reliables.ru/wepekojozovozunuviponewufdvrr.pdfIn PDF document text
    • http://study-english-04.space/bluebeam_free_studentvsjcz.pdfIn PDF document text
    • http://manthoughtswebsite.website/como_hacer_una_corona_de_adviento_facil_y_economicaawy0n.pdfIn PDF document text
    • http://zdsshop.top/toyota_camry_2018_xse_remote_start8cl0w.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/how_to_replace_glass_top_on_kenmore_stove.pdfIn PDF document text
    • https://waxujonugo.weebly.com/uploads/1/3/1/8/131871493/wilofupuxo_gerizasatep_rigasoxafafe_lapizego.pdfIn PDF document text
    • http://fartook.online/excel_vba_tutorial_in_tamildcx1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futikuzita.onlinewebshop.net/all_living_things_contain_which_element.pdfIn PDF document text
    • http://lifobem.myartsonline.com/18834277888.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/kepatadexarex.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/76479234273.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_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 5724 bytes
SHA-256: c8e04fbd6ba91c1ced6c557c4c2cafe84a8b64b34ab55518544e07c15b5b6cee
font_01_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 10592 bytes
SHA-256: 4a58ef831a3d7d5564ba43f1456bae1844047013c183edbd953f4a191e3d6647

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