Malicious PDF — malware analysis report

Static analysis result for SHA-256 420343ec28f2e6de…

MALICIOUS

PDF

84.5 KB Created: 2021-05-27 03:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2da6668c0eeeb08e0f04c25834c68d90 SHA-1: 7108396b3f1ea752ff05a716753cc294cb18c247 SHA-256: 420343ec28f2e6de8fa728774544ade630c8d7f0c80777c3c1fc48847659059c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary lure appears to be a "commonlit answer key" to entice clicks on these links.

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://golowaki.ru/strik?utm_term=ruthless+commonlit+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405651/normal_6019c67704eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_60560e6e8bfcf.pdfIn PDF document text
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/fogotonurep.pdfIn PDF document text
    • https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/132935.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/pinuxetawe_xitabum_suzepolej.pdfIn PDF document text
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/dulumiz-jatobugofewidat-fazekipok-zavoranub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481513/normal_5fe50e652a8ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ffb1d78afdcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_603742e5c5cad.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/6082886.pdfIn PDF document text
    • https://minesipapotevu.weebly.com/uploads/1/3/4/1/134108733/zajewofalop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df97400c-baaf-47ee-ab8a-05f0542184af/what_is_structured_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c150765f-03b6-4c95-8901-a61f1bfb8e16/29229511995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1650f5f-bbbf-41a4-9baf-6ff25a9b16f4/the_medium_is_the_message_meaning_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ccf57b2-ed7e-405e-b342-08ad09c50980/what_bible_says_about_marriage_and_divorce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c50d35-e62c-4440-831a-d0639c8c0a7d/ranger_aluminum_bass_boat_for_sale_used.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_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 5660 bytes
SHA-256: d98e47dfe35f438bf365fc9d2ae1b56240a1cd2d1eb63b48c4d991707904027c
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 11404 bytes
SHA-256: 2bc9f2b11c9058877742837a20631defc23b31186fae39c30e15377d0c8197c1

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