Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec02f12d4d84e606…

MALICIOUS

PDF

82.9 KB Created: 2021-04-25 03:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7575598ade4029bab0f3a7a8101ad19 SHA-1: cff091a2aa824344cda74c5fa8159c4e69a982a2 SHA-256: ec02f12d4d84e606e1b72719ea6d221dca945176c3797d8f66457063b907a32a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=bissell+symphony+pet+vac+%2526+steam+mop PDF link annotation
    • http://autobaff.xyz/how_to_draw_comics_anatomy78mtl.pdfIn PDF document text
    • http://damvglaz0.xyz/python_set_intersection_multiple_sets9icj0.pdfIn PDF document text
    • http://student-yurist.ru/farewell_to_manzanarumxy8.pdfIn PDF document text
    • http://bluebadgeapproval.com/perfect_health_diet_macronutrient_ratiotm2gx.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/boxaderimokadoxinox.pdfIn PDF document text
    • http://instup.xyz/dell_latitude_e6430_bluetooth_driver_windows_80q1w1.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/wefafawolimogazi.pdfIn PDF document text
    • http://sk-anker.ru/lojozojinimenezunapeynpqu.pdfIn PDF document text
    • http://worldhold.online/wagujaxugimamovuwetojuft5bbf.pdfIn PDF document text
    • http://techanomic.com/wunikuvapirumus6j2wj.pdfIn PDF document text
    • http://study-english-04.space/486252971436awsf.pdfIn PDF document text
    • http://nosinoski.shop/laviwurigigawonavitu29ake.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/what_is_media_management.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_5f4249ace17a412a82c41be0bde82bec.pdf?index=trueIn PDF document text
    • http://sizemogigu.myartsonline.com/case_study_essay_sample.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_d9727617bc3f499aade5059a060cfd6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/wamez.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_c3e0c79b2cf343658c10dab8bfa5c436.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_caa115d539d948cbb66c45fb11c6ab32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/sudeje.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/worilezuvoparon.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/96763302633.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/58470275302.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 5288 bytes
SHA-256: 6747eeef9b1f14f78cae0abc52d6a395bf3212cd531fe46e1b450445b9370304
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10460 bytes
SHA-256: 2d5cd39bf9a31319c2401ed83ec58708fece4d276f786e580612bf6efc28e41c
font_02_sfnt_off00012811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 16184 bytes
SHA-256: d0c58953a4e1fafb404e5f2176a6840a0bfa0f345cd00f0fe93300516a084cf9

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