Malicious PDF — malware analysis report

Static analysis result for SHA-256 536580bc9d7d505b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-05 19:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 001d7478bb7efc1c81ecc981980ce93b SHA-1: c6513e70733d54c057545910ab7e422a4a00793c SHA-256: 536580bc9d7d505b1b99df183f19b27d598ccc28c0711d5ea1fd681e7f3b6e59
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging social engineering to direct users to malicious sites.

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://botokaw.ru/wb?keyword=how%20to%20start%20a%20homelite%20chainsaw PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5ff2baa19ac30.pdfIn PDF document text
    • http://devgame.design/physical_chemistry_10th_edition_by_pqdz3z.pdfIn PDF document text
    • http://mavito.online/94984216428dm0dx.pdfIn PDF document text
    • http://gufutaca5.xyz/shalom_aleichem_goldfarb_sheet_music2mkjw.pdfIn PDF document text
    • http://copyright-security-ig.com/masinusuburugipuxekeromitbcs7s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fcff515cb254.pdfIn PDF document text
    • http://pollsexpert.com/cracked_nord_vpn_apkxk558.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/pomagexezetafuf3fnc.pdfIn PDF document text
    • http://volosaty100.xyz/what_is_the_best_swim_spa_on_the_marketwl6tw.pdfIn PDF document text
    • http://ericksandoval.com/oxford_picture_dictionary_english0b32z.pdfIn PDF document text
    • http://stickerrus.ru/nemofozejaluid14a.pdfIn PDF document text
    • http://probmake12.xyz/korean_alphabet_chart_a_to_zap6se.pdfIn PDF document text
    • http://hallhq.xyz/street_fighter_alpha_2_mod_apkmfodd.pdfIn PDF document text
    • http://dfds.in/chaitanya_charitamrita85t5r.pdfIn PDF document text
    • http://buzifun.22web.org/10412122811.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/nuxomigo/driver_s_permit_manual_book.pdfIn PDF document text
    • http://kegepedefaripi.epizy.com/how_to_install_ezdrummer_2_expansion_packs.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/duke_require_sat_subject_tests.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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 5092 bytes
SHA-256: 3d1c2e25b0b1ecb2cfb01029f8673ff4ced0a8b9d15e983f463a2110387f2004
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10552 bytes
SHA-256: 0cc69e397c85a2125664029372bd38abdf5819f16882eee8847a89a05b9ba6e9

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