Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b844fe520f47e2…

MALICIOUS

PDF

92.6 KB Created: 2021-03-23 16:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1247f615454b007bda2c0c146b483a0 SHA-1: 7c32d75cd88e91426a9af75d1acd436f7c97a91a SHA-256: d3b844fe520f47e296bb4edb79b1baa0c3ec09b72165e7bc7669555428c94228
154 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of a 'download button' lure and the link farm heuristic suggest the document is designed to redirect users to malicious websites. Although no scripts were explicitly extracted, the PDF structure itself can contain malicious JavaScript, and the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=chinese+elementary+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393359/normal_602b4f89dd948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_5fe76a18cc5ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fee7d7c50935.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/juwofexogav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_602738169a38b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5ffb133b7a942.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/malavenesotogora.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/icpFJje/surf_shack_tobay_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601aff8136c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_603a768a2e2bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_6041d5969d176.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/lgfnOhd/best_grocery_shopping_list_app_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fd7b9434713b.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/dirt_devil_featherlite_carpet_shampooer_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6045056c71603.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/fezoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413239/normal_5fdd3c33d6cae.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/HqidShj/photo_editor_filters_and_effects_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jonawepatem/jdgh0eR/wow_classic_slice_and_dice_vs_eviscerate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_6041d22c0635d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagugexasorip.myartsonline.com/73922438548.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/o_come_to_the_altar_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 7616 bytes
SHA-256: 60ed981dd6f7636b04ed913ec1e3c0751a30a56b9d565cc40bbf985711ed8319
font_01_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 5492 bytes
SHA-256: 3d1c8ce6d9e0b55b14a7d44365c180f03a7f609e1a9bcbac7ecc3581db6a7c16
font_02_sfnt_off00013c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C82 11536 bytes
SHA-256: 294f23e761fb01ec6e52fbc0b9189dd6e6351e054441a5e1b9c636d7b5e91216