Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b54ff5db69bac19…

MALICIOUS

PDF

77.0 KB Created: 2021-05-03 23:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8a9f71329273e61e0a6004e99492bf06 SHA-1: 5ab76d164a31426e33f3d5dab27fb1194252a545 SHA-256: 5b54ff5db69bac19fa8ea3a17a6902763753133c6d3d901ec22c3f84dac07cc3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=how+to+stop+fire+alarm+from+beeping+after+changing+battery PDF link annotation
    • http://favarivizuna.medianewsonline.com/zubiw.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/17605236756.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/arykM0E/79371708068.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/widjcij/avro_bangla_font_free.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/singer_7469q_confidence_quilter_electric_sewing_machine.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/4994205.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/toleralabepukum.pdfIn PDF document text
    • https://cdn.sqhk.co/puvivefujef/jghaG84/62440936274.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/2gcXiJ0/battlefield_4_commander_download_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_86263dacd56d48c7b5a7f508efe74366.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/sajaxifufazusikiz.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_fe383e18a17b48a4bed0ed9f43919df3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/51554619865.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/15088298483.pdfIn PDF document text
    • http://setovoj.onlinewebshop.net/possessive_adjectives_games.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/adanga_maru_tamil_movie_tamilgun.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/what_is_mean_by_adaptive_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/21065101992.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/cause_and_effect_of_water_pollution_worksheet.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_1c885e397a6941a6b99d5616d4e373d5.pdf?index=trueIn 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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5724 bytes
SHA-256: a6fdddb275a4f77d89791a7fcf6be3bdeeac44ec82c7f9901c408f4569fe4183
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 11484 bytes
SHA-256: de6d96327cb13191f2bd2ac2b6c302afe34fb26fda26df32b74eb252bafa5cf6

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