Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d657d8c4fde41f…

MALICIOUS

PDF

81.0 KB Created: 2021-03-19 04:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb57a3364631922b18fb2e20f6411178 SHA-1: 28f2ddcdcc8b3df798e0459f6f3c8f2a1d972594 SHA-256: 99d657d8c4fde41f1fb9be7204793d63a793772407c827dc7cbe49db3e5627df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a phishing lure, specifically impersonating Apple. It includes numerous external URIs, many pointing to disposable hosting, and one critical heuristic explicitly flags it as brand-impersonation credential phishing. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the presence of embedded URLs and the phishing context suggest an attempt to redirect the user to a malicious site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/zimaxederuxebe.pdf.
  • 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://soxebez.ru/strik?utm_term=biology+textbook+college PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447641/normal_602faf514053a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fe935b6baa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_6035cc13f0bee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402721/normal_60064b51351fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5feefc1d52662.pdfIn PDF document text
    • https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/zimaxederuxebe.pdfIn PDF document text
    • http://storeplus.info/agar.io_hack_apk_2020sinka.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/1043859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5ffd6e7d100ed.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/11bc9456.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/saxuderegaten.pdfIn PDF document text
    • http://update-win20.online/problem_gps_garmin_nuvi_3597gbe7w.pdfIn PDF document text
    • https://sapefesoj.weebly.com/uploads/1/3/1/4/131453354/netikosupojadan_vufatasati_lebamu_fawekaxugepakiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fccbc6e4fbac.pdfIn PDF document text
    • http://beststudent.space/icaew_errata_sheet_sbmr8ceq.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/42579655403jmmtc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vagakidid.epizy.com/shinee_world_concert_iv_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f36a025-0e32-44a5-95ff-a1ecba2d7cc0/does_my_roku_tv_have_screen_mirroring.pdfIn PDF document text
    • http://rixuweba.rf.gd/81430442312.pdfIn PDF document text
    • http://zusobudem.epizy.com/luximufito.pdfIn PDF document text
    • http://tafisazovelowu.rf.gd/gewevipedolakaz.pdfIn PDF document text
    • http://dasiletu.epizy.com/gikurebewedogiguxusipojar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca04836-4681-407d-b9ed-d16eefa98730/brother_p-touch_d200_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85a9c2a-7a4d-402d-be1f-a9b01415f033/what_does_it_mean_when_your_dashboard_lights_flicker.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_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 4904 bytes
SHA-256: 56de626ddb8d440657baa318671fba9a0196abf7b55eeec3555723aa6d4c9b01
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 11864 bytes
SHA-256: 722dd0974aaa732d1754d01a88da4964fbfd3e703e4a930d0ad885f1df3a76a9