Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bdc964fecb9428…

MALICIOUS

PDF

84.2 KB Created: 2021-04-08 22:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7bbcef9822361b456b28c81f7bf5a2e6 SHA-1: 9d92a81fa296898991eba9f7009b3985da8df7d8 SHA-256: f4bdc964fecb94286f3f88e8045e99fcdb0633b76eead89fd2d9b8b542fb2fd4
186 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. 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 0.9997

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 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://botokaw.ru/strik?utm_term=presto+deep+fryer+cord PDF link annotation
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/betobudowokej_lupuluniw_dofaxirusegit_zetipa.pdfIn PDF document text
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/edfe66a0a.pdfIn PDF document text
    • http://bafujoresepivi.iblogger.org/barakixigemesukuti.pdfIn PDF document text
    • http://cmb-societe.com/green_juice_detox_diet_recipeni9t8.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/best_neve_1073_copys0nzt.pdfIn PDF document text
    • http://belkwigs.com/best_books_for_yoga_teacher_trainingphlzz.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/bimizaxipaza_zewus.pdfIn PDF document text
    • https://rugakimi.weebly.com/uploads/1/3/5/3/135323030/3094592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1c0f4df0-8c1e-458b-a009-0fa2aafe3fbb/how_to_measure_efficiency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5f280f-1817-4f41-b5c2-58741891ce1c/44641618361.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/sulopolegujijexavode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6202b9-a0c0-46b5-9f8c-4e5064a4f83f/the_castle_kafka_chapter_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdb242b-e660-4c16-b45b-237b23db492f/nutawuxopazibukupabajikip.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/amman_songs_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1ae2f0-442c-483a-b1f5-efa9706978c4/the_bronze_horseman_movie_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/how_much_is_wedgewood_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a4780b-0e47-4c1e-8388-3a8101a7c5a6/56690670273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba7dcac-60c7-4564-aa1c-3de3ccd6b72f/what_did_john_paul_jackson_die_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c7d4b8-3c41-441f-b804-6a06b893a54c/mapa_de_riesgos.pdfIn PDF document text
    • http://tilomid.rf.gd/carl_sagan_hindu_religion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 4644 bytes
SHA-256: 24c377ecc68989179508af076a2d9391829905175d7f7d6e3b85662b81fdb65e
font_01_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 10616 bytes
SHA-256: cb78e3a47e8a3605f279d3b7590fe5ba041b1ec559abb7c0e454577ebb985031
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3