Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5051c4882125f50…

MALICIOUS

PDF

72.8 KB Created: 2021-04-02 11:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe32f4bcc03312a6752e71b63babdf20 SHA-1: c4d3027737342538f09083dfc0476eb7ae5caf17 SHA-256: d5051c4882125f50815530d5ebe2f6bb2722d71d294d1b1894816aceb9cc2052
186 Risk Score

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 0.9998

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/award?keyword=metodos+de+abstinencia+periodica+pdf PDF link annotation
    • http://vaxenovutejuzid.sportsontheweb.net/aprenda_a_desenhar_guia_completo.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/samiwofibizujapurezoduk.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/dwojbjb/6596166776.pdfIn PDF document text
    • https://cdn.sqhk.co/zojudaje/fgjgcif/zihale_masti_old_song.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/bf2008cd2deb.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/3987701d7.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/xugadolu.pdfIn PDF document text
    • http://bobatorosas.mypressonline.com/libujoponiroveluk.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/dd1eb.pdfIn PDF document text
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/rakirazetopaguw.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/act_practice_test_mcgraw_hill.pdfIn PDF document text
    • https://damesijegimu.weebly.com/uploads/1/3/4/6/134624484/kunerosatadot.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/f50f957f03d1849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwedozesa.atwebpages.com/astral_projection.pdfIn PDF document text
    • http://regujag.rf.gd/how_much_do_acorn_stairlifts_cost.pdfIn PDF document text
    • http://fanixagef.rf.gd/clothing_care_symbols.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 5264 bytes
SHA-256: fb18a4f89fb4143a55a677092c9ee83e9354549083db26219794ffb47e284f31
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 11672 bytes
SHA-256: d5dfc738a4f3ae69f5cb52835154119a743e359cb8a98377fe08a9bc89ed575a

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