Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b21230c912d124…

MALICIOUS

PDF

115.8 KB Created: 2021-04-07 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 68a98aa0939187e6205d4b88621a68e9 SHA-1: dba10c71259c509aed7bdaf03bea4a0f3b219298 SHA-256: c9b21230c912d12494a081e35eae861a3d1202fc1ecdcb2b775ebd5b192971a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to 'Samhsa anger management workbook spanish', aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=samhsa+anger+management+workbook+spanish PDF link annotation
    • https://cdn.sqhk.co/gegefemorosu/fiisigW/tatazusivudibujibegag.pdfIn PDF document text
    • http://pop-marketplace.ru/jurassic_world_toys_mattel_t_rexiqozv.pdfIn PDF document text
    • http://xegisepereti.mygamesonline.org/68261438399.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/Kie9ihP/duo_mobile_app_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/dhdjbha/vuvukup.pdfIn PDF document text
    • http://inostrana.com/78640214729ktg0k.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/tactics_for_listening_second_edition_answer_key.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/gutefovemuja.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/heat_treatment_aluminium_alloys.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gggGhgt/nujaluwovijig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punotonaduwize.atwebpages.com/54912407283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203615ec-92f7-46b6-ab76-1c3f7c0bf3bc/bokewirewam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47cd1740-9cf2-4b1a-b14d-cb34d1ee54a7/74618071639.pdfIn PDF document text
    • http://vusanaxipunuli.rf.gd/cambio_climatico_en_mexico_2019.pdfIn PDF document text
    • http://wugetad.myartsonline.com/33231713015.pdfIn PDF document text
    • http://jikokajogov.rf.gd/regrouper_deux_en_un_seul.pdfIn PDF document text
    • http://zogonigabi.rf.gd/music_player_apk_samsung.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD0 3064 bytes
SHA-256: 853f993b97a6ef13d4f33c44dfeffc31ef2e0f71392b5230c63e5a4a03543fb2
font_01_sfnt_off0001669b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669B 5600 bytes
SHA-256: 61b9a6ff1d7ba352b27a40f557d3f07f777d29c84d058b73bd0a073222011a0f
font_02_sfnt_off00017987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17987 2696 bytes
SHA-256: e8be56af3d92217536b73de280a5db17ca784aa277bb529b6b9689c10dabacbf
font_03_sfnt_off00018581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18581 11580 bytes
SHA-256: ac305428ca0dec627c395b7531b00d2b82a93ddf29a132546aefc6e226b84182
font_04_sfnt_off0001ac4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC4C 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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