Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b258f5f95fa969…

MALICIOUS

PDF

81.7 KB Created: 2021-06-03 11:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7e0255cdcda8da8b2a01d08aa87f0b7 SHA-1: 3b904473a2f36ba65d519128ca4587ed5d9c29ea SHA-256: c0b258f5f95fa969e13543bbfb6f9d5a7a2796ab797fe93aa8401c6fc07a80ef
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8088

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
  • 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
  • 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://crysiq.ru/pbw?utm_term=giney+mottola+carrillo+hija+de+yadhir
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/xinijunobowufep_vilowasokunixu_ferejaporelat_kevigise.pdf
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/3b3a431b3a.pdf
    • https://wefenofutote.weebly.com/uploads/1/3/4/8/134873272/056a01327721be2.pdf
    • https://letenusesek.weebly.com/uploads/1/3/4/3/134310332/7088229.pdf
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/4f06e9.pdf
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/namifujevotiz-xinudaleduvof-setepamofusat.pdf
    • https://buweselaxe.weebly.com/uploads/1/3/0/9/130969446/868680287.pdf
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ff000c7f046d.pdf
    • https://mukiniga.weebly.com/uploads/1/3/4/3/134318698/wovunusunuvawit-rasenupu-ragugobos-fikobaxolo.pdf
    • https://static.s123-cdn-static.com/uploads/4385421/normal_6007a75ed88fc.pdf
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/gezesiwimo.pdf
    • https://xobisopi.weebly.com/uploads/1/3/1/3/131379629/kefite-jotosura.pdf
    • https://kijaxupujik.weebly.com/uploads/1/3/2/6/132695195/gipofakujeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/989231a7-48b4-4dc4-aa4f-2ad2ace64560/semezir.pdf
    • https://uploads.strikinglycdn.com/files/a51f115a-e15e-4425-88dd-74a161a6dd47/darukax.pdf
    • https://uploads.strikinglycdn.com/files/6de7c5c1-5c3f-4859-9e31-5f9ed853334a/how_do_i_pair_my_lg_soundbar_subwoofer_without_remote.pdf
    • http://zufiwuz.pbworks.com/w/file/fetch/144556524/life_science_genetics_dihybrid_crosses_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/bad83578-dd38-4dd9-82b9-807742591c9e/58871227672.pdf
    • http://zolunegoli.pbworks.com/w/file/fetch/144516723/aday_retmenlik_snav_hazrlk_kitab.pdf
    • https://uploads.strikinglycdn.com/files/f22a4323-80fa-4f93-bb7b-af86c5da568c/rivavin.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c6.bin
f4e497feaf70cc1a3db9501d3d75f3e43829f76f1935d2f1f6a03df9c991c433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 5208 bytes

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