Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e405772f0cce26d…

MALICIOUS

PDF

79.1 KB Created: 2021-02-27 06:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7f7f042482594f7892fa09f7e7c12629 SHA-1: 9ed09ddc21e03359924a0d983e4d0777f4297da1 SHA-256: 7e405772f0cce26d3fd4e58a277f2655a8489c04a10826b4173b3314183bbec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The document contains numerous external links, with a primary focus on `http://bilkan.fun/how_long_is_navy_corpsman_schoolgogbd.pdf` and `https://golowaki.ru/strik?utm_term=ashton+kutcher+and+mila+kunis+children%2527s+names`. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing operations by directing users to a large number of external sites. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

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 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://golowaki.ru/strik?utm_term=ashton+kutcher+and+mila+kunis+children%2527s+names PDF link annotation
    • http://bilkan.fun/how_long_is_navy_corpsman_schoolgogbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5feed5f239c43.pdfIn PDF document text
    • http://1green.space/frosty_the_snowman_song_lyrics1fbm4.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/woxobuwamipiga.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/eb0uDcx/guess_the_song_from_the_lyrics_quiz_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5ffe2ab8e1cb8.pdfIn PDF document text
    • http://arendaavto.taxi/cultist_clue_korinthwtvw8.pdfIn PDF document text
    • http://s7hmus.org/zowiwurolepevafunemev2zzz1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_600819b452947.pdfIn PDF document text
    • http://nnorm-id.com/lia_informant_app8xtkv.pdfIn PDF document text
    • https://cdn.sqhk.co/dakusoripujo/ByNEjaA/hepatitis_b_surface_antigen_negative.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hghjfMo/4008672652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fc8dea5a874e.pdfIn PDF document text
    • http://testbankcart.eu/Solution-Manual-for-Design-of-Reinforced-ConcreIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedilegol/cantina_band_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/soundarya_lahari_meaning_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/28304964026.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/kiragesin.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/17188480845.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 1644 bytes
SHA-256: 2b05a3adb112a40af8bae0cae56046f773a95dfeb999eab1f5bb2d06a31f91c1
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 5268 bytes
SHA-256: ce5fc4feb91b58bfdcf8e6e7cc3db19f825945130f511b6ded635dd90139da6b
font_02_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10648 bytes
SHA-256: 79ebae27f6239993ca1dfb71ef1ce83e7453c9fd2bb73088c8ef5340ffb89003

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