Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fc99261fff4dad…

MALICIOUS

PDF

84.9 KB Created: 2021-03-16 09:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9fb3fd78782ebc68e5d9c628e93ff74d SHA-1: c391fa3e09dcc43a37d6364e0b255e94059a3ec3 SHA-256: c4fc99261fff4dad330a33d38a7b41f30acade1cd52291c4f74c3cf9a3c21be7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The document body text, though heavily obfuscated, contains keywords related to 'proschools final exam answers', indicating a potential lure. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or redirection attack.

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://nipisod.ru/wix?keyword=proschools+final+exam+answers PDF link annotation
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/41468898cdeda6.pdfIn PDF document text
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/e483d60a3350c.pdfIn PDF document text
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/7cf359a30.pdfIn PDF document text
    • http://goldstein.berlin/baby_milestones_6-12_monthse29eg.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/Qjchhij/artillery_sidewinder_x1_v4_review.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/kigixe.pdfIn PDF document text
    • https://nixetamusizag.weebly.com/uploads/1/3/0/7/130740210/forawino.pdfIn PDF document text
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/xokimanojikag-rexivesotaz-sivitovivefufon-vuwes.pdfIn PDF document text
    • http://justamorem.com/52790759419yje8.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/cCkpidh/gift_guide_for_code_vein.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/gib1vgi/stunt_extreme_bmx_boy_mod.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/144e0524-a1c1-4557-b5a8-73d6d93c7604/que_significa_la_palabra_lienholder_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf2275c-4ce6-4f5f-bf9f-cb6833bc303e/95093284936.pdfIn PDF document text
    • http://sipujajawe.epizy.com/debetobenoke.pdfIn PDF document text
    • http://natadomemorad.epizy.com/cloze_procedure_worksheet_2nd_grade.pdfIn PDF document text
    • http://posufimiru.rf.gd/is_there_an_i_paper_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892d8a33-0dfa-4538-8c53-80534a2977f3/should_the_word_professor_be_capitalized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8953fc10-f41b-42e5-897f-4bc33f1d2dd2/maths_formulas_for_bank_po_exam.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_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 5284 bytes
SHA-256: 3f6619dff43a8f8d77ac8aa94ea09d9adbef3d80087d8661fd54bf73c52b4cb2
font_01_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 11084 bytes
SHA-256: 4d31eb4b685fff40051803c199eb2cb88981f3353f707f7a6a064a838c7f5746

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