Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f651435b7d43721…

MALICIOUS

PDF

77.5 KB Created: 2021-02-20 21:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 219b92266ba93302d2da7b2d7d0900f8 SHA-1: cafc071098059d0adb1c70be66f5cd829f170fae SHA-256: 7f651435b7d43721048a040c713b097641139617906ed2476b449eaaab40e2ad
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded URLs, forming a link farm hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=why+is+my+voicemail+not+working In PDF document text
    • https://cdn.sqhk.co/ropobemuma/tTOhagd/wizz_air_fleet_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/fUonQQT/81190485491.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/Iibhihb/hill_climb_racing_online_jio_phone_download.pdfIn PDF document text
    • https://tijotado.weebly.com/uploads/1/3/1/3/131382447/dirunawobivif.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/tapediture.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/lorosig.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/buritib.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/foxov.pdfIn PDF document text
    • https://wodikaludesavoz.weebly.com/uploads/1/3/1/4/131453455/9962374.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jcjjeRM/modern_warfare_3_weapon_levels.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/fovobutavokujew_xusemapik_rulij.pdfIn PDF document text
    • https://luseviji.weebly.com/uploads/1/3/5/2/135298280/7e2cea3d25b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5fffd14f8242c.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/zerevuloxa.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/gyzjfT4/mini_golf_near_nowra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_5fd34c5bf2aeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fed4740228c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_60237f9feaf64.pdfIn PDF document text
    • https://noguvipeves.weebly.com/uploads/1/3/4/7/134717425/8419038.pdfIn PDF document text
    • https://sitatovap.weebly.com/uploads/1/3/1/4/131438195/fopidu.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/abce6b2.pdfIn PDF document text
    • https://zegepami.weebly.com/uploads/1/3/0/8/130874110/e4e5771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_600a83a6c6a49.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/kupuf-suweragetofukox-pamabiwa.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/1aa684e43487.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
    • 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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 5332 bytes
SHA-256: 98061a91328f3ea856038ea315a8c6fc557f1bbd5d6a6d68ad36c2708f5a1b54
font_01_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 10264 bytes
SHA-256: 76cb3c9ebe77dd022f8166486c48675a17e38538eb9b0551df5370ad31abe90f
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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