Malicious PDF — malware analysis report

Static analysis result for SHA-256 047693f1a12418cf…

MALICIOUS

PDF

79.0 KB Created: 2021-05-08 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7ae89d0a21f7a09aced9281620f23ad SHA-1: 25df738b1bc467f0bdc30fdcafabc94f76963b02 SHA-256: 047693f1a12418cf28c97d61e61adfa1330fdf51e59cc0ecda537dd87134b00b
244 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to disposable hosting and redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly flagged the PDF as malicious. The document body text, though heavily obfuscated, appears to be a lure related to a product search term, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=cyberpower+1500va+won%2527t+turn+on In PDF document text
    • http://kuxuvajivor.iblogger.org/basic_principle_of_mass_spectrometry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fd76b94216a2.pdfIn PDF document text
    • http://doxulim.iblogger.org/kolid.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/do_hiccups_make_your_heart_stop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6015728d165df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fd5fac261994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_60693b8453b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_606a6aace670f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_60600671a92ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_60677259eeafc.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/poulan_pro_295_chainsaw_chain_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60307a19ca9ff.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/fujapumemojukufuxer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/blocky_cars_online_apk_file.pdfIn PDF document text
    • http://setobefo.epizy.com/5350807720.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_abcfa846060a41119a6f487511552c4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/judosomijafotosonakaj.pdfIn PDF document text
    • http://redexini.epizy.com/woguraxobizigifesur.pdfIn PDF document text
    • http://tosijikis.onlinewebshop.net/16188901190.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_bc996b342bab4149a4eca0a96ab63947.pdf?index=trueIn PDF document text
    • https://72be5e1b-4d14-4335-96ee-88463f604c48.filesusr.com/ugd/57ecfe_a007005fb16443b4a3ddcce1fea5e6c4.pdf?index=trueIn PDF document text
    • http://supajiwa.myartsonline.com/rozadup.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_a5f142661ac24391b4afbf29bbee37f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/bonemorut.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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 5256 bytes
SHA-256: 9c117855f9675e5decf8fd61d627485a0292fc74d4c9d85b153a04438c149f1d
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10900 bytes
SHA-256: 83b223a5ad9a52b641d0e4be67744f553762ec793b2112902917fa81083dc5e4