Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5776078e23f4f4b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-22 03:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 54c93ea85f2210845cd52f945ecc39e1 SHA-1: febe2cfe7ea9a8a6b11806c9da034adf5671d538 SHA-256: b5776078e23f4f4b171865a2a41b34949737679747f18549b55fcbbd748f4563
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL being https://bologen.ru/wix?keyword=great+depression+and+new+deal+study+guide. The presence of a large number of external links suggests it may be used for SEO manipulation or to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=great+depression+and+new+deal+study+guide PDF link annotation
    • https://jenevokitajawol.weebly.com/uploads/1/3/4/2/134235402/3597789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fe75968bec05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_601a01d63956f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_5fd38667a1104.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/7302023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5ff87dc00f9fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6034029786d85.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/7f51fcc.pdfIn PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/risekew-jivejolum-vavizawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_6039d4424f957.pdfIn PDF document text
    • https://guparamoribum.weebly.com/uploads/1/3/2/7/132711937/nesasabipirak-tetilofix-ludasulujavime.pdfIn PDF document text
    • 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://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_93469a71c1b641ba8a5dd766f16b782c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabevog/digiliwusuwinenazajexud.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_7d88c81931354ca580ab6d647d4c4f7d.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_f3ade2330dd04c23a54f11750a2cc78f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/defiant_outdoor_lights_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/tumagujovebudugarokofufi.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/education_board_result_2019_marksheet.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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 5236 bytes
SHA-256: 439d6fca0f5409559b315ededbdadf24b4f55670344874bbc5c73fce7e2c759c
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 10596 bytes
SHA-256: b0717e66bdea87c69ef03ad0302d1c3b9c846cab5f1a44867f533bd260df4747
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c