Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709f2cf3881ef2a…

MALICIOUS

PDF

74.2 KB Created: 2021-03-11 07:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d3c287249a21f8310e365686bb34712 SHA-1: e6ba1492aab877fad3bba440336cf7e73f8692b5 SHA-256: 7709f2cf3881ef2a9b1b73f8b2a7216d5f98422d14af1c10ecc26f3feb323e41
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 0.9956

Heuristics 6

  • 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 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://xezojetit.ru/wix?keyword=wrestling+apk+free+download PDF link annotation
    • http://lnstagram-blue-badge-form.com/tp_link_841n_firmware_v93s8g2.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/diary_of_a_wimpy_kid_the_long_haul_jeff_kinney_summarypy2zt.pdfIn PDF document text
    • http://ruszaimclub.ru/gujuxalipezabinobfnq.pdfIn PDF document text
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/2933005.pdfIn PDF document text
    • https://nakotibuvifotog.weebly.com/uploads/1/3/4/6/134619478/e581e2fa1cd6.pdfIn PDF document text
    • https://naduvita.weebly.com/uploads/1/3/5/9/135973463/rulopojesego-panuradovi.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/bgp_configuration_commands_step_by_step.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/skycaddie_sw2_gps_watch.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/8965038.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/dheifih/timiladof.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/viiuif0/gamade.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/lakinopaxeresaj.pdfIn PDF document text
    • http://tehnotop.store/tenafozafilifatogoxopomavh3c4v.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/what_is_a_non-linear_timeline.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaloruligot.onlinewebshop.net/best_short_stories_collection_books.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_9bf2cc47896f41d4ab15e4fc85416cb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4498eeb-f9c3-4890-a498-7859507a86fd/what_grade_is_lexile_1200.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_ebdc9b9d105e489c97dde148acdda803.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/485584a2-84b3-44da-bc6d-9f2b6eade71c/defining_and_non_defining_relative_clauses_exercises_intermediate_level.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/percy_jackson_the_titans_curse_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c622a2-48d3-476f-950b-4deddf860358/lazopezadanukugosuxoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f412e96d-3ed3-4c52-b73f-c8ccfa0c9063/what_is_a_security_risk_assessment.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_2f81456fe8dc41b18ff984d052f24181.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65805441-dd7e-47cd-9286-1da1d46da8b1/kimudugaxo.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_0ce7f237e7fb4318853e1bfbe070603b.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_333c85f4d33a48daa64740fb6187a296.pdf?index=trueIn 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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5380 bytes
SHA-256: 037221da58b02a4e76a21b44b9801c7d8e9489a362acf6c59ebfebed0b322feb
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 12528 bytes
SHA-256: fbae9233387eeddb9e06145207d8204b3251ff69e95d64ed2cb78b77269f1488