Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba17951fe2f9a4c4…

MALICIOUS

PDF

64.5 KB Created: 2021-01-10 07:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a014f41b240f0a93209497ee84a73fea SHA-1: 6ef1738c8c722ed8bafb50a21aaa6255bfca7877 SHA-256: ba17951fe2f9a4c440f3c2df8cb9e16294b54f95e954218fac35119bbd654ce7
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be part of this redirection scheme, likely to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/aws?utm_term=ambalapuzha+kadavil+vacho+song PDF link annotation
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/tomajebak.pdfIn PDF document text
    • https://site-1175261.mozfiles.com/files/1175261/72838558111.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/MGMiaia/56101912714.pdfIn PDF document text
    • https://site-1178466.mozfiles.com/files/1178466/teacher_assistant_hourly_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/axifMjf/pico_iyer_books_amazon.pdfIn PDF document text
    • https://site-1181110.mozfiles.com/files/1181110/twitter_logo_copy_and_paste_emoji.pdfIn PDF document text
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/5315b45ecfa7b3.pdfIn PDF document text
    • https://site-1179601.mozfiles.com/files/1179601/how_artificial_intelligence_helped_sophia_robot.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jeI10pd/born_to_die_lyrics.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/3182332.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/iabghuv/dragon_models_usa.pdfIn PDF document text
    • https://zezexofoji.weebly.com/uploads/1/3/4/3/134344156/eb9c55f01c.pdfIn PDF document text
    • https://cdn.sqhk.co/kosozezoxuxe/djiKONj/best_falling_block_puzzle_games.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/ijhicjd/72617267250.pdfIn PDF document text
    • https://site-1180061.mozfiles.com/files/1180061/tubewekogazupimijexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 5692 bytes
SHA-256: 7ee7ab698bfafefe515fb47d5333e1cd0252107b814ceb1bb96cf2243760142d
font_01_sfnt_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 9968 bytes
SHA-256: ec5233143b1e8617aaf4a39bb612f9e27470e2f3bac358c0ee70e303ac34bb4d

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