Malicious PDF — malware analysis report

Static analysis result for SHA-256 162599c44296af2a…

MALICIOUS

PDF

84.7 KB Created: 2021-02-03 08:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d5d036496a2ecce33addf3806fa15fb6 SHA-1: 793b5fe10bca32770ea6f3721621e817b7ba1dc4 SHA-256: 162599c44296af2a9d7d94616ad12116bcbdbd7702d01bf3cf59ef575c502055
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=los+12+disc%25C3%25ADpulos+de+cristo PDF link annotation
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/a63efcffb717be.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/64c0f1ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_600497d579c28.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/1190441.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/sadizidiluvutibix.pdfIn PDF document text
    • http://sunny-web.ru/pix_color_color_by_number_pixel_art1rylb.pdfIn PDF document text
    • https://bazajiwudimikot.weebly.com/uploads/1/3/4/3/134344454/68c580.pdfIn PDF document text
    • http://nicepics.xyz/chordal_harmony_janek_gwizdalaqxq6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fdc2766bed2a.pdfIn PDF document text
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/wolumosunoxuwus.pdfIn PDF document text
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/3414024.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/3453495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd6a8c21cd74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fe0a9ebb933d.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/597863.pdfIn PDF document text
    • http://circulshtangcalip.website/puloxorezofrujjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_600bd71e9007b.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/83cc2.pdfIn PDF document text
    • http://haustova.com/10316987202ytzg4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagawajali.epizy.com/aryabhatta_images.pdfIn PDF document text
    • http://vulitogegitutop.rf.gd/bhutanese_song_2018.pdfIn PDF document text
    • http://dojopugoput.epizy.com/letter_e_sound_worksheet.pdfIn PDF document text
    • http://sokurunofizune.rf.gd/audacity_free_for_pc_windows_10.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_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 5036 bytes
SHA-256: da663790e816185d7ae0724ec9a22ddcd5ee37e9d1dc4b63d22b79ab67b9b290
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 11652 bytes
SHA-256: 4c6f7b870d074c8d075fd33bda56c33844c34b6e0f4ff52a14c22aa5bd40ce08