Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e34ff5d601f891b…

MALICIOUS

PDF

73.5 KB Created: 2021-06-12 00:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b76b3df6ff190db85a8b912372db71 SHA-1: e28e0e7175c4da1336169a4a0934d8ebac4d4c1e SHA-256: 9e34ff5d601f891bc76e325d3b30f89851f1fc2f9681810e0317b1f64f461f27
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://infrive.ru/pbw?utm_term=140+nm+to+foot+pounds', are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the nature of the link farm suggests a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://infrive.ru/pbw?utm_term=140+nm+to+foot+pounds
    • https://tasakexer.weebly.com/uploads/1/3/4/6/134669330/nurat.pdf
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/567a2e9c270d.pdf
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/xanamulefit_pozitinab_bogofu_jibem.pdf
    • https://vobuzotoxat.weebly.com/uploads/1/3/4/7/134705481/cbedb95f.pdf
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/4748713.pdf
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/0a7a945ba659ed.pdf
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/potojubujujuz.pdf
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/5399267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wukisifoker.pbworks.com/w/file/fetch/145057110/hack_osu_download.pdf
    • http://diruzonedod.pbworks.com/f/pufesaj.pdf
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144610185/78211630363.pdf
    • http://dekokos.pbworks.com/w/file/fetch/145160409/crochet_doll_hair_pattern_free.pdf
    • https://uploads.strikinglycdn.com/files/ac6b4838-6046-404e-9af1-971e0ea643af/1740121186.pdf
    • http://lagawiwefe.pbworks.com/f/41840374657.pdf
    • http://fafevupu.pbworks.com/f/weird_human_anatomy_facts.pdf
    • http://wiwudoje.pbworks.com/f/luxifut.pdf
    • https://uploads.strikinglycdn.com/files/e031ef11-57c5-42de-8b58-ac2a4d4ed6aa/tijimorazavotipife.pdf
    • https://uploads.strikinglycdn.com/files/94617d62-2472-45f8-8f06-9163347335e6/how_to_fly_in_roblox_hack_2020.pdf
    • https://uploads.strikinglycdn.com/files/72f57489-d8a9-424e-9b3e-bf64cd61ccb5/bad_credit_score_auto_loan_rates.pdf
    • http://javefanudosa.pbworks.com/f/vabulirofaripiforotipefe.pdf
    • https://uploads.strikinglycdn.com/files/e58eb3b4-c058-4f42-b5a4-d093783b6d2e/ver_pelicula_completa_el_despertar_del_diablo_en_espaol_latino.pdf
    • http://jojekepodef.pbworks.com/w/file/fetch/144626781/bubudunofitejijarotupom.pdf
    • http://muzupusap.pbworks.com/f/enrique_hero_mp3_song_download_320kbps.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ec.bin
9057af951b3e0fa5817ecfcd9be1d1fc8d6ab0892da4028da4a52db2651aa95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 5036 bytes
font_01_sfnt_off0000f30e.bin
ae2b27e31b74480fdfa4ea838284e09ec350c450ee3e7e76ddb36b061adc0a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 11172 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.