Malicious PDF — malware analysis report

Static analysis result for SHA-256 7670bbdf00c52484…

MALICIOUS

PDF

69.0 KB Created: 2021-03-17 02:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce55298788748ed38a1b7ddaa730234b SHA-1: 08731610176a6fe5e95cc81f9a800bfc59339038 SHA-256: 7670bbdf00c52484f5ab1d473eebeee38b7b81efc796c354b201683ad84b4f31
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One prominent URL, 'https://xajibur.ru/strik?utm_term=whirlpool+duet+sport+dryer+repair', appears to be a lure for users searching for appliance repair information. The file's structure and extensive link farm behavior indicate a likely attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=whirlpool+duet+sport+dryer+repair PDF link annotation
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/momabumufifito.pdfIn PDF document text
    • http://mukoxadetovewo.66ghz.com/lanewed.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/e34Ogd4/mcps_portal_parentvue.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/julubeza-xusukij-vabek-lolagikoro.pdfIn PDF document text
    • https://zalogarigi.weebly.com/uploads/1/3/2/6/132695681/rururadeli.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/7hCfibk/snapchat_logo_black_and_pink.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/gQO6q2Y/coliform_bacteria_in_water_and_pregnancy.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/fejirifero.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/72FhEP6/manor_cafe_hack_unlimited_stars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selominur.epizy.com/92763014323.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_6b00020f7ead4ac38a1716b26e8b7a60.pdf?index=trueIn PDF document text
    • http://titasigor.epizy.com/89197417254.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_e9f39a81b0fb4707828b07b675a1b3b9.pdf?index=trueIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_a2fc1963777d49f986d93faf14e97b29.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_5ae3dacdebdd4742b3bd49d232e9f768.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_7da37e3debc8439d9bdee1190f3cb4e6.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_04617a222b6449d8a23d802bea06ad74.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_1cbcc9ee1e094607806f67cca8364a15.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_496a8f24e9d94749aa9da2012c8c3d35.pdf?index=trueIn PDF document text
    • http://demunoj.epizy.com/19107474230.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 5164 bytes
SHA-256: 9291814099dd053d16802a8892d62fb53cb92cf292cc5030a1f83ff8637dd5ec
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 10064 bytes
SHA-256: a7ccbe0a1e7415e54fc1f5e07eab0b1959631adcfe68254f1f5f2d11a96f88ed