Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c97bbe1e488a2f…

MALICIOUS

PDF

70.6 KB Created: 2021-03-22 06:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef204ae863d2d89b395713618b6daf16 SHA-1: 15d6fe45e4030b71f53e099042ac1fb7f1b133ef SHA-256: b7c97bbe1e488a2f1371fc3ac850a4b500472b066d6eeb86ffd1767f80e30814
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to attract search engine traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://maypoin.ru/wix?keyword=scale+development+theory+and+applications+pdf+download
    • https://cdn-cms.f-static.net/uploads/4465386/normal_6041f267097d4.pdf
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/376708891248984.pdf
    • http://reduslimitalia-official.site/190348343599eyki.pdf
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/4641017.pdf
    • http://1yamal.space/monster_in_paris_full_movie_in_hindi_download7t5tu.pdf
    • https://cdn-cms.f-static.net/uploads/4420939/normal_601399bec7a45.pdf
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/midewiziwove.pdf
    • http://vas-rem.ru/gajugu7owpw.pdf
    • http://kersita.fun/127402804052tup6.pdf
    • http://freedate18.xyz/learn_english_grammar_step_by_step_in_marathitj85q.pdf
    • https://cdn-cms.f-static.net/uploads/4375696/normal_600c9c4285572.pdf
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/makino_kajenamegu_gevowatoxizixi.pdf
    • https://cdn-cms.f-static.net/uploads/4460944/normal_60485167af294.pdf
    • https://xonugovelixef.weebly.com/uploads/1/3/0/7/130739086/5115457.pdf
    • https://static.s123-cdn-static.com/uploads/4386333/normal_6003a1a818e7c.pdf
    • https://cdn-cms.f-static.net/uploads/4457573/normal_603922c4bfd5f.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6009e3c27990d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://natunolujekusi.epizy.com/why_do_we_need_critical_appraisal.pdf
    • http://narolojekidutaj.rf.gd/xapexawizezibirik.pdf
    • http://porilebunenagu.rf.gd/kit_logo_persija_dls.pdf
    • http://wilisen.rf.gd/18756051457.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_off0000d60e.bin
5bdc90039fb2921968a953ecceb50a741b2ce334828b91c8eefc5452079002fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 5752 bytes
font_01_sfnt_off0000e99e.bin
846562f63f517dffc8b1114f712c98c6d6ea3986fe9b5b00ebdb93d429fd021e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10388 bytes

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