Malicious PDF — malware analysis report

Static analysis result for SHA-256 4082089371f99bb5…

MALICIOUS

PDF

71.2 KB Created: 2021-05-24 16:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6534443288a5399581f9ef1c006c0091 SHA-1: daee7e6d0418ea35ef1089f25a4647fe72395ce5 SHA-256: 4082089371f99bb55f9df415eb5cdaa0a0bc584195a36d45f2a4ba4d78c9616d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=ktm+engine+serial+numbers PDF link annotation
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/4624513.pdfIn PDF document text
    • https://telejifuzi.weebly.com/uploads/1/3/5/3/135313468/9621423.pdfIn PDF document text
    • https://xolasugoduto.weebly.com/uploads/1/3/4/5/134592704/8d16580fc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459054/normal_60077d76df932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_6027e6493aa3e.pdfIn PDF document text
    • https://wafedegexusib.weebly.com/uploads/1/3/0/9/130969596/2245d1544.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/gawabog/xuwoje.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/lol_pbe_na.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/google_chrome_apps_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/razoximateribufesalona.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/aircare_ma1201_evaporative_humidifier.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/fubosazidokudipevilaresir.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/fivikisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/tesutozadonivadenekigeke.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/how_to_deal_with_hearing_loss_at_a_young_age.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/bozesakezinupenafepanenev.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/get_droidadmin_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/19730964149.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/xolomegudojerifofapolu.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/bang_bang_tamil_mp4_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/31472424996.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5112 bytes
SHA-256: 30fc0d1da1e9e3084d7abce459e8a0aaf37961fb770e0ea1b5d89d436dc350ec
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10172 bytes
SHA-256: c6cd0074df7cd943fefa183015f7e3fffa223c0f4d58f7ea36997976fe392856

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