Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d0e8ba9358eb88…

MALICIOUS

PDF

81.2 KB Created: 2021-06-06 22:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 858a385db77e8d500f4ca873b4d014e1 SHA-1: e05bd903ecec063a88cc86c45b11a8e7b00e4a3a SHA-256: a4d0e8ba9358eb887a915682f4101328c5806329ded5cf208672820c05ba493b
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

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
  • 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.
  • 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://nomylo.ru/pbw?utm_term=shandong+new+hope+liuhe+group+co.+ltd PDF link annotation
    • https://fasexunatosupa.weebly.com/uploads/1/3/1/6/131606354/4684395.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/910f2a82.pdfIn PDF document text
    • https://sirofutalaga.weebly.com/uploads/1/3/4/7/134706343/1487ae448c.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/zafumuporonenuxak.pdfIn PDF document text
    • https://pabalosuto.weebly.com/uploads/1/3/0/8/130813917/jewipetapazavi.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/texude_tuwukujukejuba_lifalot_tiwazafexifa.pdfIn PDF document text
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/93b028.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/tebasemuvezutaremozu.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/xurad-tugudonadew-gikunasibimo.pdfIn PDF document text
    • https://fexifetonazez.weebly.com/uploads/1/3/4/4/134492485/2858205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ede61c-7cd0-4191-ad8e-aacc6e174569/ocarina_of_time_great_fairy_of_power.pdfIn PDF document text
    • http://jakomija.pbworks.com/f/burger_king_grilled_chicken_sandwich_meal_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0732a41-ed63-407a-bdc5-66f1d44a2040/how_to_get_a_distinction_in_english_speaking_exam.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/40204394944.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/how_to_know_what_bareminerals_shade_you_are.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/vudabeb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 3972 bytes
SHA-256: 5957ca7afb72eb98260f86069bda87b85eca19ac51750729116b0203d6f49a2b
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 5384 bytes
SHA-256: 62aff19a430d1b9846c512e60022818dab986b12038ccc2e2c1c5ab374755e10
font_02_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11568 bytes
SHA-256: 8125b0b6a9e6c6142e78231d595592b3bb4bcb2131f40560ce52eeb40b56b448
font_03_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16208 bytes
SHA-256: d6691d7f4c8b10877bd25af26bde883dd7762551e2d4f138d151c425b6578ade