Malicious PDF — malware analysis report

Static analysis result for SHA-256 86be54bcb7236a4b…

MALICIOUS

PDF

77.0 KB Created: 2021-04-28 14:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6106d25842ddba5b37b5316b4a7b3306 SHA-1: c663930165838ce67548b2b51256c2cb5ef1cc6f SHA-256: 86be54bcb7236a4b58c83b2267a908d6d1c3e72ae9709076217f1a018df77aa6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to malicious websites.

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://zajinet.ru/strik?utm_term=how+to+improve+intuition+pdf PDF link annotation
    • http://vivadoctor.ru/29119338999l6t61.pdfIn PDF document text
    • http://neviresutuv.iblogger.org/66051054749.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/4000379.pdfIn PDF document text
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/kobepujoroxoregosuvu.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/menokelekuvaj-renulijedapem-ronenakowon-jonux.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/dezunitenofog_mavivumazurid_jubewan_mefuxorexiser.pdfIn PDF document text
    • https://damozudi.weebly.com/uploads/1/3/0/7/130776403/mofipekimub.pdfIn PDF document text
    • https://pajobozonojamu.weebly.com/uploads/1/3/3/9/133997184/ruwatugewuvivusi.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/26288937290.pdfIn PDF document text
    • https://posalezonekat.weebly.com/uploads/1/3/4/6/134628665/e5ddfe.pdfIn PDF document text
    • http://giocodigital.fun/what_age_do_high_chairs_go_up_toefble.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xisanekaxutup.epizy.com/58699649530.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/1663046755.pdfIn PDF document text
    • http://voxarenilime.epizy.com/fezulupilelazinodusaju.pdfIn PDF document text
    • http://gataton.rf.gd/2145986670.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/lagu_blasta_rap_family_2017.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/adding_text_to_gif_android.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_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 4880 bytes
SHA-256: 1351e80a199d6a4d660aaf3104df1137a2fff37e7c17a2d0aec7c89ccc5db97b
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10548 bytes
SHA-256: 262509dff124f21044711507a1798c853bc99f654358079e504890c3f3f1f4e4

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