Malicious PDF — malware analysis report

Static analysis result for SHA-256 0571ca5b948dbabc…

MALICIOUS

PDF

82.8 KB Created: 2021-02-19 08:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ca881a0f9b206f0134de2e4613f696a5 SHA-1: 0837055e62d5d6233930ad891ca229761fc7fe75 SHA-256: 0571ca5b948dbabc0ccc625b4147d01cdedcb9ffd7b9b83867de6cdc8ae829d7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=d20+modern+weapons+locker PDF link annotation
    • http://steh-sistem.ru/sibisenokoxirifevotikotaseii8m.pdfIn PDF document text
    • https://vizojifura.weebly.com/uploads/1/3/1/0/131070272/zatiwijut.pdfIn PDF document text
    • http://lianhua.life/936247792159ugeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nigezufi/bgihdjc/gatagonewosopanizisofom.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/sizodukip.pdfIn PDF document text
    • http://mir23.xyz/asus_aura_sync_windows_101mhvu.pdfIn PDF document text
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/sawegew.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/1FgjjgM/wovodilaf.pdfIn PDF document text
    • http://mattelipsticks.site/motivation_letter_for_mba_programme31k7g.pdfIn PDF document text
    • http://triple-doska1.club/ramofhcwn6.pdfIn PDF document text
    • http://samyog.ru/what_is_my_postal_zip_code_philippines_wikipedia78h7j.pdfIn PDF document text
    • http://wrinklestiltskin.com/japanese_grammar_exercisesgmojw.pdfIn PDF document text
    • http://stroymarketmetal.ru/18416672417ikr1p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_60057519bd5b0.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/nghQcc5/monster_high_venus_mcflytrap_dress_up.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/womeva_romizawoteta_nusonogigud_bibuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/ip_abuse_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/76391674035.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/41579340709.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/72020586330.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_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 5648 bytes
SHA-256: 38e7f601d60b858e8e23e55d48b8b01794a22a4cd5e16573f65f5f8a858ae916
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 11728 bytes
SHA-256: f90af3b8f97c281f7321d839fcbaf0aa41b12f3a0d62d015bf3e6b3b1dc7d6ba