Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b31d7229c479a1…

MALICIOUS

PDF

77.3 KB Created: 2021-03-28 04:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 206e38c870c744f2ef035bc96f8abf46 SHA-1: d468a21b0ef8ad1e776726979c889d407c9d3ff6 SHA-256: d7b31d7229c479a15150f0286d405da57ecad28fdb65b981efada4597cac2436
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a "free download" lure, aligning with the phishing classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/infin?utm_term=asme+b31.+1+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406228/normal_5fd29dba4081b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_604794960cedc.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/98940338175.pdfIn PDF document text
    • https://xifuforemavu.weebly.com/uploads/1/3/1/1/131164534/4164fc73c243.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/bapukuse.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/vedic_maths_practice_questions.pdfIn PDF document text
    • https://tekebuzegox.weebly.com/uploads/1/3/0/8/130814382/b8569c1a9.pdfIn PDF document text
    • http://felagem.getenjoyment.net/adobe_photoshop_cs6_tutorial_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/j2Ehhie/kotedemuwefojevo.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/optical_biometry.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/h7YjixJ/open_houses_today_blaine_mn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_602a01b1c96fc.pdfIn PDF document text
    • https://dinofewujib.weebly.com/uploads/1/3/1/3/131379591/3a4f3b8.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/7ghih5h/square_stool_painting_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_601b44935076e.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/simple_amplifier_circuit.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/Fgj5jfF/cosmoprof_las_vegas_locations.pdfIn PDF document text
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/tunujowibuxel.pdfIn PDF document text
    • http://tututot.mygamesonline.org/performance_appraisal_form_sample.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/77893037613.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/37196854088.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/dezajok/peruvian_gamefowl_fighting_style.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/how_to_change_name_on_my_sin_card.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_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5656 bytes
SHA-256: 4e0ddfdf2dbbb0059342e6c9a069a4e23f65138294000b7c610333a7bdd6e8ed
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 11068 bytes
SHA-256: edeb29b46592af07e7fb380cbeec19088f5bc65038fa17b5bf968c8065219c0c

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