Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9427d8efeea0a7…

MALICIOUS

PDF

84.8 KB Created: 2021-03-31 12:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1eba70f5072064e6b71051d2124b6084 SHA-1: 5e049d30cc2957f9289c22c2616d194623a85c24 SHA-256: fc9427d8efeea0a7bbd70f02ff512a9f36f562c0274930a1fd12cfc236eab398
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ponafet.ru/123?utm_term=lake+arrowhead+ca+fishing+report+2018 PDF link annotation
    • http://zuvels.xyz/19844256048an5s1.pdfIn PDF document text
    • http://www19216801.site/sodegegusejo3urs8.pdfIn PDF document text
    • https://siviwoxepigomuz.weebly.com/uploads/1/3/0/7/130739754/9739256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_6041c526a650e.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/academic_reading_practice_test.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/700d1208e50616.pdfIn PDF document text
    • http://natur-green.fun/ansiedad_mexicosq345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5fe6f9b857703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_6015008779de0.pdfIn PDF document text
    • http://myimperfectmomlife.com/opposite_words_in_odia1xlzg.pdfIn PDF document text
    • http://hookup157.fun/boney_m_song_daddy_coolucmxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_6009d03e529ac.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/bdc1b45d85ae.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/lotarojafotelivipepem.pdfIn PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/20a82241aa0d9bf.pdfIn PDF document text
    • http://mx50off.info/peretizaxewukinunejuk9edc.pdfIn PDF document text
    • http://lokusenikuxole.iblogger.org/how_do_i_calculate_cubic_feet_of_a_freezer.pdfIn PDF document text
    • http://nicechange.space/9757723342kdkto.pdfIn PDF document text
    • http://apeech.ru/organic_chemistry_john_mcmurry_7th_editionz0lbk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segegasagemoxi.rf.gd/tepabija.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/rti_application_format_in_tamil.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/blood_bowl_season_2_roster_sheet.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_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 6000 bytes
SHA-256: bc1dc561df576c376a166256b3b1f99eae4849c53a0aea64d9ddce5cc5df326d
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 11904 bytes
SHA-256: 235f64096765173f474be4c1328b99e8235a992c440ffdde512ecedb65f921b1

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