Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfb5991c5127512…

MALICIOUS

PDF

82.9 KB Created: 2021-03-06 14:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6cb49de0b9590265bf0059ec82fbb966 SHA-1: 598434a0de95db01fdd6c63fd7b95381c0ee6d58 SHA-256: fbfb5991c512751277e3b12e0b7e2d403aae0a953bdaac7b8ba3510766618869
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=hot+spring+portable+spa+control+panel+instructions PDF link annotation
    • http://xifadezuzurap.medianewsonline.com/40937619621.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/9409397571.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/dyna_glo_rmc_55r7_wick.pdfIn PDF document text
    • http://options.expert/comptia_security_mike_meyers3je3f.pdfIn PDF document text
    • http://natural-shop.info/592842422655wq24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42483df8-3c9f-4004-8937-cfa3a5f0318f/aeschylus_oresteia_themes.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/6789672606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4465414-4f9d-498b-bf16-7fff04b30d41/ley_de_ohm_y_potencia_elctrica.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/arithmetic_and_geometric_progression_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd921e81-6c78-4b11-aea6-518fdc5c94f0/munogudinisonapivimamex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad42c842-6894-40e2-8d94-5381882f70c7/kuxip.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/carmageddon_tdr_2000_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65251540-f40f-443a-8c1e-88d1b20830de/rakubegaxumetuluxajut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fcfb0d-909a-4085-9b88-b5b198a907af/57652850931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02aa8045-35d6-4ee4-8bb5-d198a7a05815/how_to_update_iphone_4s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f5f210-21a5-440b-bfa0-a1c3cc71a516/64788743644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abc3db4-ae57-437c-a97c-96f238ed6812/zupuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0fbdb0-97a8-45c0-8e12-dfadc2a42a93/is_trans_surgery_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c674dab3-f022-41cd-b281-34f14fdc58d4/introduction_to_biblical_interpretation_-_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975eb4f9-597d-47ed-b8a8-c587ecad113f/speed_and_acceleration_calculations_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48255b5-9584-46dd-aaa3-dc2bfa492766/best_whole_house_standby_generator_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/xubuseji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a594e655-4b2c-4fe4-8554-ddf67ed5760a/dixiduvosibapidomunabu.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_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 5204 bytes
SHA-256: 160a420e6ba7aa7f8f436281fd00d950f6ec3bce125d830892baa0df12c88c84
font_01_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 11012 bytes
SHA-256: 1e080b4c01eed36ba306f0a69db2dff0882771912f5bc9660cdee32c6617f64f