Malicious PDF — malware analysis report

Static analysis result for SHA-256 e930bf2d88a75de2…

MALICIOUS

PDF

180.4 KB Created: 2021-02-23 11:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ac371daef4e61f72fa1cb5ce5ff14ed SHA-1: bd91bed0ee063d1579bf880a513edeefb7d3162d SHA-256: e930bf2d88a75de29fd7cfcf509b98ab3e2fc46f77343c620d7c0b716efd3355
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 0.9996

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://crophysi.ru/123?utm_term=how+to+write+a+poetry+chapbook PDF link annotation
    • http://ing-jobs-opportunities.com/lucky_block_minecraft_ps4r39h1.pdfIn PDF document text
    • http://twoup-viktoria.online/poniva4hdtn.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/idhjfjb/20865014957.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/8a9b3555d.pdfIn PDF document text
    • http://life-news.tech/66228579182pp2jd.pdfIn PDF document text
    • http://jewlgems.com/kafujarugelivejm3n2.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/iYfiegi/nuzobubos.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/c0bjbWs/2807435318.pdfIn PDF document text
    • http://superheatbelt.xyz/vudodakuluvemio62z9.pdfIn PDF document text
    • https://zogetira.weebly.com/uploads/1/3/4/5/134502553/tuxegi.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/mgcgjXX/fanab.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/4741837.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/jcif8ib/koworubuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/hbjchgB/72968308700.pdfIn PDF document text
    • http://ecoservice-vlad.ru/32375043368xto70.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/iaie7ii/plants_vs_zombies_heroes_wikipedia.pdfIn PDF document text
    • http://big-ita.space/field_work_report_formcfpkg.pdfIn PDF document text
    • http://rocketdocs.us/smart_launcher_3_pro_apkpureb235p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00028944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28944 5168 bytes
SHA-256: cc9b0a81ed8add56f052af21fff42141ab75f3d18fb0463afa14e650b23d0751
font_01_sfnt_off00029ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29AE8 12720 bytes
SHA-256: d049976ebe0c60d7c240f7ce1ccb8dee8b17d5dae1ea279e3f89ed98bedcede8

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