Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6f74218ba6d8f0…

MALICIOUS

PDF

103.3 KB Created: 2021-04-05 00:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a9f4d01cf50de19761cfc9928f6d4a9c SHA-1: 417a6d4907f4c136e35ddaece908beee81db69d5 SHA-256: 1b6f74218ba6d8f064b1fae6973c7d60073e4295a4916ddfa8181711056e4c51
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, designed to redirect users to other malicious PDF files. The primary lure appears to be a fake free download for a nursing pharmacology PDF, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wix?keyword=nursing+pharmacology+made+incredibly+easy+pdf+free+download PDF link annotation
    • http://idealslimitaly-official.site/litokadisorafuxuxawazolwlor1.pdfIn PDF document text
    • http://pomirkapa.site/copperplate_calligraphy_from_a_to_zyh3j8.pdfIn PDF document text
    • http://musofiron.ru/bagpipe_sheet_music_thunderstruck7lwnm.pdfIn PDF document text
    • http://gonzo-3d.com/wobetumiwexulajovc3fp.pdfIn PDF document text
    • http://ru-dev.xyz/pitegulokekdzv1e.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/how_to_start_a_toro_leaf_blower1v483.pdfIn PDF document text
    • http://gelchlen.fun/laxufadokiarou3.pdfIn PDF document text
    • https://zeniladafisu.weebly.com/uploads/1/3/5/3/135320186/8424368.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/e0414c3c6.pdfIn PDF document text
    • https://mokefogo.weebly.com/uploads/1/3/6/0/136086775/sajubot-voriworaxare.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/voxulija/92412284275.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/cordless_skill_saw_7_1_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/ridifukadifufukakoxarob.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/febodavaja.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/bible_amplified_version_apk.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_6c2a31093d6546b9a023becb10366483.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_e560219e95a14c8bab2bacddbe1fd609.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_559f387280df4068ae4d13630265f48a.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_b8d9e2ad99dc414cb756c3e0c4058425.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_9b15820cf33c47b69b01afb10b067d9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/51315103717.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/the_humanistic_tradition_volume_1_7th_edition_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED5 5872 bytes
SHA-256: 3cd366eca0dea6965b411fbf55f320a01afba71dafa5ddb00e03b0d55e44c786
font_01_sfnt_off000152c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C4 11616 bytes
SHA-256: b93feceae4f6e5657bf2c4b6d3b468a62c8fc5b7255005ff8b38becb3dcf462f
font_02_sfnt_off00017a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A3F 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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