Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85c18aeea2b5731…

MALICIOUS

PDF

79.8 KB Created: 2021-02-18 05:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7081491f2c5e4096824614e996a67b31 SHA-1: 69a0875edee08f2a453df806462f2dfe653799fc SHA-256: d85c18aeea2b5731fa0b7714a9995986b4d2afcabdf095a621940d3eb8df1910
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with the ClamAV signature pointing to phishing and trojan activity. The primary function appears to be directing users to a multitude of other PDF files, likely for SEO spam or to serve as a distribution point for further malicious payloads.

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://leonvi.ru/wix?keyword=quadratic+function+word+problems+worksheet+with+answers PDF link annotation
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/bebolepikosopir.pdfIn PDF document text
    • http://tehnoprom.org/fawikepeweloxukitama68pi.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/gesogipi-pijovenamavu.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/pixar.pdfIn PDF document text
    • https://kabibejago.weebly.com/uploads/1/3/6/0/136050231/5bf231a8d00cfc.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/bexenojidebuk_lefasapasimav.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/butuxurezelibuvalur.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/mujowenofe.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/jatadosevekebu-falod-mizod.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/gegevodapero_kenokigeriji_sudaxesupizob_duwoxozudejoba.pdfIn PDF document text
    • https://diforugagok.weebly.com/uploads/1/3/2/7/132741100/5dbae519d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nezenomawaza.epizy.com/a5_brochure_template_free.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/kododobobabaki.pdfIn PDF document text
    • http://mevezexagugon.rf.gd/capture_one_pro_free_pc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 5752 bytes
SHA-256: 9b5d1c3f3def23381ceb8fe33cc0f6be19f41c919d9aba950094c2704afeb5b7
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 15228 bytes
SHA-256: 5fa372c42709587d47aecd53290a75b7d8ccce887a1e887183881dbe4fab50ef
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e

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