Malicious PDF — malware analysis report

Static analysis result for SHA-256 2815597277ed7171…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 05:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 559c0a9873fc53c8b38025a7f525dd4a SHA-1: 1dcec166fd54501b5f9be5cf49f8592a5855e423 SHA-256: 2815597277ed71711208b6645edf59222225f263970a4a0883957a22b6a9aad5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic indicate an attempt to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=windows+7+32+bit+size PDF link annotation
    • http://vas-rem.ru/xoxuzexibazb5x8.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/blockchain_for_dummies_2nd_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5fee532ed2d7b.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/amino_acids_reference_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/W6ihPqf/poweramp_v3_skin_rainbow_apk.pdfIn PDF document text
    • http://huseyincanx.com/sepasumiximojuni8ss.pdfIn PDF document text
    • http://daimontimur.org/51193917960ndzgu.pdfIn PDF document text
    • http://stopnutristrike.ru/what_type_of_bond_is_potassium_nitrate7bwbg.pdfIn PDF document text
    • http://medgaj.com/15055595036j5al5.pdfIn PDF document text
    • http://torchqbfl.fun/xizewiwaz7p1ti.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/fOgcAk3/39982128720.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/Jhjgcjh/marble_blast_2013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_600541d7c39ee.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/kubegusisugok3llse.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/movike.pdfIn PDF document text
    • http://beremoter.online/hot_springs_vanguard_price_uklyvj8.pdfIn PDF document text
    • http://re-prime.ru/how_to_pair_jam_hang_up_bluetooth_speakerjxkn0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojozore.myartsonline.com/kalnirnay_may_2020_marathi_calendar.pdfIn PDF document text
    • http://rabelame.atwebpages.com/algebraic_expressions_questions.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5152 bytes
SHA-256: f1216ae544b0bfff658ae6ec19d97d0b5875c7374fc61a9d1dc6291672565965
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 10436 bytes
SHA-256: 93d2bfac32f5afdea3182f6b7e99b89d9a84f1a6525bd7083f8187adea51278c

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