Malicious PDF — malware analysis report

Static analysis result for SHA-256 be34ec2168d12715…

MALICIOUS

PDF

74.4 KB Created: 2021-03-23 09:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e289722991a20b45c3f3274bb89509b0 SHA-1: 22604f1f7b30bec810a64311b715472275c604b7 SHA-256: be34ec2168d1271597a43975a31d4827aacef24d291688dede5e4f32123e44a6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics indicating it functions as a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier strongly flags this PDF as malicious, and ClamAV identifies it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'Attachment definition pdf' and 'wkhtmltopdf', suggesting a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://yafferge.ru/award?keyword=attachment+definition+pdf
    • http://mokemowowove.mygamesonline.org/how_to_put_water_in_a_brita_pitcher.pdf
    • https://cdn-cms.f-static.net/uploads/4478141/normal_60571176610d1.pdf
    • https://cdn-cms.f-static.net/uploads/4495855/normal_60568eeb27b31.pdf
    • http://gelokan.sportsontheweb.net/xipakirexerifasiwolojobev.pdf
    • https://static.s123-cdn-static.com/uploads/4412996/normal_60070b303534a.pdf
    • http://naliputa.mywebcommunity.org/cub_cadet_rzt_50_parts_amazon.pdf
    • http://rabiwitijif.medianewsonline.com/garmin_gns_430_manual.pdf
    • http://xorimomupajo.scienceontheweb.net/jesus_mi_unico_amigo_fiel_cancion.pdf
    • http://surozofawowidom.scienceontheweb.net/bank_exam_syllabus_2020_download.pdf
    • https://cdn-cms.f-static.net/uploads/4500679/normal_602c832e4c920.pdf
    • http://fumumowovufa.mywebcommunity.org/away_in_a_manger_sheet_music.pdf
    • http://toxusuzom.mypressonline.com/81014048884.pdf
    • https://cdn-cms.f-static.net/uploads/4447626/normal_60552a555dbc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_f81cfedac6aa45c1934cd8291c29ff4b.pdf?index=true
    • http://kilarosine.atwebpages.com/causes_of_postpartum_hemorrhage.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_981d06c990914775bb581ae22f56f7c0.pdf?index=true
    • http://sozuwag.epizy.com/lakimokuwiz.pdf
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_fead29a149ac4c108fe91ae3913a73af.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_c5b07f6c51f34565a69ee5800f308843.pdf?index=true
    • http://tetizawoto.rf.gd/angulos_entre_dos_rectas_paralelas_cortadas_por_una_transversal.pdf
    • http://devugagevubuz.rf.gd/28757663520.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_off0000e588.bin
56786556d8279fab356c99b3e67d02059f63cc8d596b4b1813720c420c5a4953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5076 bytes
font_01_sfnt_off0000f6b5.bin
252e5adcc6675ad9cd5a4fc727499534464ba34ccca03fc03499516f3c61d5f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10612 bytes

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