Malicious PDF — malware analysis report

Static analysis result for SHA-256 e708ae757bdca8e9…

MALICIOUS

PDF

73.2 KB Created: 2021-03-14 14:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aa1045bdb134a6677137722210536367 SHA-1: a3d9fd5facb93af6e5f1b757fd8221baadea7f60 SHA-256: e708ae757bdca8e9c50a482d827bea6d1ccdffac5885748cfce3674274f67c16
166 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of 'pwsh.pdf' in the document text, alongside suspicious URLs, suggests an attempt to download and execute a second-stage payload, likely using PowerShell.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://maypoin.ru/award?keyword=applied+research+and+basic+research+pdf PDF link annotation
    • http://bukuxojunuz.mypressonline.com/afzelia_quanzensis.pdfIn PDF document text
    • http://cenderaoriginator.com/kimowegiragudezufeppwsh.pdfIn PDF document text
    • http://shlifovka-pol.website/wafokedadexanivixili5pzwk.pdfIn PDF document text
    • http://50offstore.pro/naguduxijusalorezesiys5ws.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/bakexu.pdfIn PDF document text
    • http://lopozodedawap.22web.org/limopu.pdfIn PDF document text
    • http://wuxakex.iblogger.org/naxax.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesuIn macro / runtime command snippet
    • 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/1474ab45-2b42-4fac-ae50-be09d81f654e/what_is_the_meaning_apparatus_in_tamil_passion.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_36af668664b545c4992cadacf30c25d9.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_4243a0c6c2ee4c68a9d0561ceacbfc49.pdf?index=trueIn PDF document text
    • http://xetatiwu.rf.gd/icse_board_examination_date_sheet_2019.pdfIn macro / runtime command snippet
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_ad2c546cf7d042b580d6d2edaf0d3982.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08926a53-0661-46f0-865f-3b477b93a921/sportline_stopwatch_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069bb1d2-b825-4766-9364-13af8822b129/56416585993.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/99582171156.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_52ab20884d194c9bb6500f3e7d3bb17b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1913d2-19bb-4969-ab97-4b47c4450cb6/how_to_solve_a_2x2_rubiks_cube_easy_steps.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/oncology_drugs_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/levawerozubenunit.pdfIn PDF document text
    • http://xagadikexebixa.epizy.com/placa_dentobacteriana_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/11902262584.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_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 4972 bytes
SHA-256: 9017114b47a934ece233298b3e7e827e616a9ebd7631b78e5dfec32bcf5856c2
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 10672 bytes
SHA-256: ccc230a4336432ff7e4ae78e34eefde514563342acfd3ffc84cba68351b6497c
font_02_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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