Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0603b15ef460fde…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 18:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87831c0ec0fedab503e152a2c10212bd SHA-1: 373fcb80c8d6df702c57c242bc24414843d2bb1c SHA-256: e0603b15ef460fdebcaaafedb880227c0a4deff082799f647f0f743e9ed691e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, but one critical link to 'mezovuduw.ru' is flagged as suspicious. ClamAV detection and ML classification strongly indicate maliciousness, specifically identifying it as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to create a deceptive link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=advanage+20x+ingredients
    • http://kagaromorin.medianewsonline.com/principles_of_geotechnical_engineering_9th_edition_chegg.pdf
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/2779307.pdf
    • https://puritokubopop.weebly.com/uploads/1/3/5/9/135968540/regajufanefa.pdf
    • https://vedifejoroda.weebly.com/uploads/1/3/4/5/134521361/dekufi.pdf
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/64e91fdcdad4b97.pdf
    • http://zutatowatipo.mywebcommunity.org/axis_bank_net_banking_form.pdf
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/797302d49e9c9f8.pdf
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/janid-wagej-wafamapu-tinofesurevebo.pdf
    • http://newuwedeza.mypressonline.com/cyberpunk_2077_hdr_pc_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizedumi/vozupufatalimefuvevopuxov.pdf
    • https://s3.amazonaws.com/sugosubexez/nattamai_movie_hd_single_part.pdf
    • https://s3.amazonaws.com/sinadi/movigegebixat.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_8ba17e57d56a4a788da542e03c12e3f9.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/filurekoziweruluseg.pdf
    • https://s3.amazonaws.com/jedaxopopuko/jezonenumesijisorekedi.pdf
    • https://s3.amazonaws.com/fukezavazuj/rokaxakobob.pdf
    • https://s3.amazonaws.com/gogunabones/sekafunogebekisuni.pdf
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_b2b840df8ffe4abbb343a2a7e1e59e01.pdf?index=true
    • http://ginowane.onlinewebshop.net/bakery_business_plan_sample_philippines.pdf
    • https://s3.amazonaws.com/pukiza/wafufuderunumem.pdf
    • https://s3.amazonaws.com/fenatagazise/indian_amendments.pdf
    • https://s3.amazonaws.com/podawakumepewez/2015_audi_q7_maintenance_manual.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_off0000f33e.bin
90674ab8959a7b79b4a3b9384963c59cbd841cc9a922074e1aeb2291905f3dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 5352 bytes
font_01_sfnt_off0001058d.bin
56b8604baf9c5604aec2a41485fbf8031e762b2eed714a5993646ee633a2f333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 11604 bytes

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