Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbe2fe269751bb0…

MALICIOUS

PDF

94.2 KB Created: 2021-03-24 03:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 827978341fb77bc8e29713d7e6459f4b SHA-1: 557880e1b3f993e28d346684cd3601486a76c49f SHA-256: 4bbe2fe269751bb0a04b990bb4b1478166fcd2c17a3066da6db639d1f30e7a1b
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 pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=personal+pronouns+in+spanish+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481280/normal_604d6d8e2a766.pdfIn PDF document text
    • https://cdn.sqhk.co/jawakagufu/iebjhhb/comics_plus_st._george_ut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fdd28eaca659.pdfIn PDF document text
    • https://cdn.sqhk.co/kibuluke/bgiidqP/birthday_invitation_format_for_boy.pdfIn PDF document text
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/76dff615014cb9.pdfIn PDF document text
    • http://magnetfix.store/20616986377hliqt.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/samsung_air_conditioner_troubleshooting_problems.pdfIn PDF document text
    • http://hermidkovo.info/what_are_the_purposes_of_lawsyki0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_601d5d866ebba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_6040f7e349835.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/jhiawhj/3ds_emulator_1._1._7_android.pdfIn PDF document text
    • http://yoga-italy.space/win_10_no_cursork7t7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_6014e3b6314be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_6025f0b84c452.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/chandrayaan_2_upsc_notes.pdfIn PDF document text
    • http://optamorem.com/leche_materna_en_ingles6hgyw.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/i_can_t_say_no_oklahoma_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/jgjiiif/10316192133.pdfIn PDF document text
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/nutujojonabati.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/cDwgcrh/lixugimonefadewizutiso.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
    • 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_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 5132 bytes
SHA-256: 51fa70df0fb240dae9960c9a5154c62aa8b21ed5d6c0272d8957c30f167eabcc
font_01_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 12448 bytes
SHA-256: a77c0874e59ba94de81a3681c94b1d31b2b3f4da2b7c1b72ffbd3bf6c0f631be
font_02_sfnt_off00015315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 16836 bytes
SHA-256: 0cf15e966e670b753014c17ca53c86471d92573b4eb1124ee2c0cebf654f2de2