Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb2e92f2e7f8158…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 09:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9a9f9dd6556d8f6efd6e85d15b3ece57 SHA-1: 961485f2770cf4a30c7f0674048f3ce0133b5ae4 SHA-256: cbb2e92f2e7f8158dd7a282a28e7886220d879073da9f5049865f7d7b5a30a4d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://crophysi.ru/123?utm_term=android+camera+preview+size+square PDF link annotation
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/b4909.pdfIn PDF document text
    • https://rifituxajigibik.weebly.com/uploads/1/3/4/5/134519767/6b591.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/6532125.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/85985202544.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/varikepokiboluvo.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/0a49f0dd-f63b-40cd-9dbc-401617cab6a1/gerd_keiser_optical_fiber_communications_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff85f3a-00ab-42b9-8899-1ebf78bea37c/kobefufadazamevotepo.pdfIn PDF document text
    • http://finezifor.rf.gd/m-audio_fast_track_c400_control_panel.pdfIn PDF document text
    • http://tobizexajivuvob.epizy.com/gaputumaguxufabireva.pdfIn PDF document text
    • http://rerupini.epizy.com/14423374978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c507705-10da-4df3-a99b-c4215eb30b72/how_to_plot_velocity_vs_time_graph_in_matlab.pdfIn PDF document text
    • http://netidufek.rf.gd/85275250877.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/messenger_for_pc_free_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/20313035397.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/88902389642.pdfIn PDF document text
    • http://kobinegugagikag.epizy.com/fovulejimajaremoni.pdfIn PDF document text
    • http://peworesafasar.epizy.com/45381997930.pdfIn PDF document text
    • http://golipoximumi.epizy.com/kicker_compvr_12_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3eb190-d590-4748-ab50-0652c235996a/34909115174.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/architecture_reference_specification_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10858a35-1208-4d11-b9d4-c2e130d94e7a/94469757318.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/73511947482.pdfIn PDF document text
    • http://romudiforexove.epizy.com/french_ir_verb_conjugation_chart.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_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 5504 bytes
SHA-256: 0a14543641262319616c5c6d7b0e10ac7e95780f5276be45a23425174f726362
font_01_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 11284 bytes
SHA-256: 8ca5d3d2990d8234759e05c8a570ffffc53edc832abb1b0f5a2933b623c8330a

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