Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffafcb79203f5e8…

MALICIOUS

PDF

77.1 KB Created: 2021-04-07 03:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bedcff5ad81bc6c69da9e515625d9b SHA-1: 6b3b604aac53c033f41fd56cdb6b4a863a814cc6 SHA-256: 4ffafcb79203f5e8598fa12ce8a4d791bd242f44ecf77fa7eb695765d838ab53
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious intent to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=jim+cramer+get+rich+carefully+summary
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/2835454.pdf
    • http://sigisuzuk.getenjoyment.net/wagijakabigejavow.pdf
    • http://santaparker.store/what_do_cogat_test_scores_mean53r0u.pdf
    • http://kirudikegopoded.sportsontheweb.net/computational_fluid_dynamics_jobs_australia.pdf
    • http://medicinfo.online/36095838708zdri3.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/5696344896.pdf
    • http://mnogolidov.xyz/oscar_pistorius_net_worth_nowgx1hl.pdf
    • http://fasekafalig.scienceontheweb.net/data_science_degree_purdue.pdf
    • http://jujovobima.getenjoyment.net/reketenezug.pdf
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/b68d1d7af85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/846ca871-ed85-4cdb-b3ed-0edcebfa2a29/how_to_charge_a_hoverboard_without_a_charger.pdf
    • https://s3.amazonaws.com/tabobujimo/5_love_languages_quality_time_examples.pdf
    • http://fufudaloxola.onlinewebshop.net/descriptive_essay_sample_about_an_event.pdf
    • https://s3.amazonaws.com/welanisowari/balancing_chemical_equations_lab_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/c9afda00-2fd2-47dc-8308-5674e2df3cef/15432370827.pdf
    • https://s3.amazonaws.com/paropabaru/annexure_3_for_form_6_sample_online.pdf
    • https://s3.amazonaws.com/fajonubinomeder/data_science_university_programs_canada.pdf
    • https://s3.amazonaws.com/vobuturinivi/2532632125.pdf
    • http://nowimirozox.atwebpages.com/is_general_dynamics_stock_a_buy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f120.bin
e71103a1e4db44cdff5b693f2c371e41080d82aa524717ca3634c9659a283d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 5388 bytes
font_01_sfnt_off00010353.bin
1f586d92d67041103d46a60f59d800aec2048410b8a8676f2b08faca7e98f05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 10428 bytes

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