Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc8c8f93f16ed26…

MALICIOUS

PDF

71.4 KB Created: 2021-03-24 10:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 862e3589a34cf9ad3cc75e5df79aebe8 SHA-1: 6fef58eadb5acfb33a587c74d86eb9a5917d7b66 SHA-256: 0bc8c8f93f16ed267a33f1160eca78bee91f821b2ddb68f6c8ec29c6f11e9dff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are SEO-themed and point to other PDFs, suggesting a link farm or content stuffing tactic. The presence of 'microsoft_powershell_3.0_free_download.pdf' and other similar filenames in the URLs, combined with the 'SE_LOLBIN_RUN_COMMAND' heuristic, indicates an attempt to trick users into downloading and executing malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/123?utm_term=kaththi+sandai+full+movie+tamil
    • http://wutugidejavazu.scienceontheweb.net/bsc_mathematics_books_free_download.pdf
    • http://wopexobow.mywebcommunity.org/30437362800.pdf
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/dozibevigojenur.pdf
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/3aca1cab12c.pdf
    • https://nesupopokajore.weebly.com/uploads/1/3/5/3/135394324/zewesemuw_vovad.pdf
    • https://wurokilusonopos.weebly.com/uploads/1/3/5/3/135345649/vesosekixiritimene.pdf
    • http://xebupado.mypressonline.com/69924604009.pdf
    • http://tepoparupomo.medianewsonline.com/51152643613.pdf
    • https://pusuxefemaj.weebly.com/uploads/1/3/4/1/134108889/ddf90005c99df.pdf
    • http://ravigimojamel.mypressonline.com/poxegotosekerafaxakop.pdf
    • http://wutugidejavazu.scien
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/26bcfaa8-4fe2-4cf4-bb70-e446c4f813f6/microsoft_powershell_3.0_free_download.pdf
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_fc1f6027e1794f4191fa78e3f7c3076d.pdf?index=true
    • https://s3.amazonaws.com/mulerux/malayalam_bible_study_books.pdf
    • https://s3.amazonaws.com/polojuliragam/mechanical_engineering_measurement_mcq_questions.pdf
    • https://uploads.strikinglycdn.com/files/88201306-b3d1-48c2-bcae-876b96d72979/how_to_enter_a_trade_in_forex.pdf
    • https://s3.amazonaws.com/widuxade/2004_chevrolet_malibu_maxx_lt_problems.pdf
    • https://s3.amazonaws.com/sesijesule/keurig_2.0_filter_holder.pdf
    • https://s3.amazonaws.com/tesasubawalozan/68461698509.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_710021d1f3414328b8a476a9249773b3.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf6.bin
3f40980b91e6eb3085fd3ed0cf289c11c86ff246161b2c4932afb7bf1c7e2e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 4960 bytes
font_01_sfnt_off0000dcb1.bin
c94088385a8a01823f6bd828a9dba94e6a143c9babeb301b5478042ab559ebc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 11024 bytes
font_02_sfnt_off00010241.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 4324 bytes

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