Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3b0ad0a7dd1faa…

MALICIOUS

PDF

68.6 KB Created: 2021-04-03 03:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62163edee7c9aaceed5573d8c1426de3 SHA-1: dcfea773fd256e990f9c588e48f066c5491179f6 SHA-256: 4c3b0ad0a7dd1faa4a7fc019a6045400e40e46bae4bd44c276aeeff954300b01
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The primary URL, https://lozipotod.ru/award?keyword=askep+angina+pectoris+pdf, suggests a potential phishing or scam lure related to medical information. No scripts were extracted, but the extensive linking behavior indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=askep+angina+pectoris+pdf
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/af7efb0bd158ea9.pdf
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/sefebasuxun.pdf
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/xigibumob.pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/52a8b4d.pdf
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/3873891.pdf
    • http://arfesopt.com/does_lowes_sell_real_john_deere_mowersx8rxg.pdf
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/7906333.pdf
    • http://gamedv.design/pre-algebra_worksheets_solving_two-step_equationsri5nr.pdf
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/1757587.pdf
    • https://dijibuxanizaxi.weebly.com/uploads/1/3/4/8/134859775/b61be14c.pdf
    • http://befigter.xyz/8832225576415o6n.pdf
    • http://begdas.fun/the_little_prince_summary_chapter_1-483ac2.pdf
    • https://xurepisex.weebly.com/uploads/1/3/4/7/134718841/bigozuzivazirok.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/rinuxovufepamuwex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/128537a2-2065-48fa-81fd-7e07d3185d78/how_to_turn_on_answering_machine_on_vtech_phone.pdf
    • https://s3.amazonaws.com/lijulijowivaze/sky_background_hd_video_free.pdf
    • https://s3.amazonaws.com/sizadagazagaj/wigogagaxelovepagarorir.pdf
    • https://uploads.strikinglycdn.com/files/8b441106-3b5d-4f41-8d07-b920006e50c6/ragef.pdf
    • https://uploads.strikinglycdn.com/files/061e783e-3954-409a-9464-7353a08e1088/141639798.pdf
    • https://uploads.strikinglycdn.com/files/708a85d7-99eb-4cd6-ad69-cdb5b59f5a37/marbury_vs_madison_short_summary.pdf
    • https://uploads.strikinglycdn.com/files/5ec7fb52-9ee2-41ad-b7ff-73fdfefa55aa/autocad_civil_3d_drawings_for_practice.pdf
    • https://uploads.strikinglycdn.com/files/dfab1c59-bcfe-41ef-8773-a43e5563ea24/aa_battery_charger_and_maintainer_review.pdf
    • https://uploads.strikinglycdn.com/files/dc8ab74b-a5d3-47b6-a705-0a8d7c7a160f/xadaxe.pdf
    • https://s3.amazonaws.com/mokamoba/nulolilaniguzefaku.pdf
    • https://s3.amazonaws.com/satuja/a4_sheet_in_mm.pdf
    • https://uploads.strikinglycdn.com/files/d72a17c2-1480-4a20-a95b-d77db4e1678f/12792219832.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d210.bin
df78e8e1de07fca75fdb0c9a566b0945142bd72ebe2ca12956a0e0c6f00e122b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 5344 bytes
font_01_sfnt_off0000e457.bin
e9461577f3d2bbdd18e48388b3f93074c2531524a79f81800eb9ed568221e80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 9376 bytes

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