Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c7b3ab5814869…

MALICIOUS

PDF

73.1 KB Created: 2021-03-23 04:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 440b99a01550a92b0fcf6ae481f2c439 SHA-1: 8d68f43abff7893fb07810f492c4e2bc20c1ee82 SHA-256: 3a3c7b3ab5814869f5af9898f67d744fb761c014964736347aa50db16d37c6f9
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically linked to a drama series title, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=bulbulay+drama+all+episodes PDF link annotation
    • http://ampinternational.org/63723023188tqxd8.pdfIn PDF document text
    • https://cdn.sqhk.co/mimizajig/jnfjiPO/juvede.pdfIn PDF document text
    • http://italdom.fun/726067939351n8ml.pdfIn PDF document text
    • http://masterpowerpoint.com/tuzulimogavozavinugiw48mz.pdfIn PDF document text
    • http://nebo-baikala.ru/39383811166ami4.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/gchh1tB/electronic_drum_studio_setup.pdfIn PDF document text
    • http://shopyou.online/how_to_rap_faster_and_clearpnng8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ffb556796609.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/gfSjaBB/36199946379.pdfIn PDF document text
    • http://goldenframecollision.com/xoradilobekuwaderuxoketoikwds.pdfIn PDF document text
    • http://arevakar-travel.com/when_the_sun_shines_we_shine_together_bible_versentpf6.pdfIn PDF document text
    • http://startbastar.online/jexifapixeziwiderdl61p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fc6d38cb5f45.pdfIn PDF document text
    • http://wonnaturila.space/84727867314vvoz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_6028a9b0e01ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_32923dc6fb1b43b0a843c2d09df8b322.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_599e1f548a094ea5ad3bb6cdfd6d436b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/audiophile_collection_flac.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/constitutional_amendments.pdfIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_c5b37f58ae5146d8944a6d7448fb7cea.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_c6abfc6b5ee8465ba5010225af412fd1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/wuginuseted.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/57806121066.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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 5396 bytes
SHA-256: 520e9a1fd686c80efa56028b66a9fea03b4f8b24aa8eaee788316d0edcd1ae33
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 11584 bytes
SHA-256: 501612f9af15c663428a6790c4abef97511fb0a1934acc85e43b6d701bee5853