Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1da5a2fa8c4943e…

MALICIOUS

PDF

77.6 KB Created: 2021-03-04 16:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7eccb2cf5f0a33e540ef63ff061e7df1 SHA-1: 35ce0ecdc64a2dc85b4be2740f6c66c4cc9e83e8 SHA-256: c1da5a2fa8c4943ecd62390a6f89e2d57f75eb0e08e1cb8cea602004ee2e2cb9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or file-sharing services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to appliance maintenance, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=how+to+clean+samsung+aquajet+vrt+washing+machine PDF link annotation
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/9366663.pdfIn PDF document text
    • http://crispyset.online/2018pa3j3.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/tekilawejixizedu.pdfIn PDF document text
    • http://freshka.fun/85374818181dawv6.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/4760327.pdfIn PDF document text
    • http://techanomic.com/lakopesekusayhwlg.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/hashtags_for_more_likes_copy_and_pastecl5jx.pdfIn PDF document text
    • http://leree6.club/hpi_7560_baja_5b-1_buggy_clear_bodys72ag.pdfIn PDF document text
    • http://yeswins.space/morosutozoximefekevufmhfsh.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/tisufenat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/what_size_belt_does_my_bissell_vacuum_take.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_6f18b785c1ca4991b967bad81e6b3587.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rirusozo/ranofevijozapede.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/lolal.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_84d9ff1075e2445d9d29be331a4411eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/76568415.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/free_diy_bridal_shower_invitations_templates.pdfIn PDF document text
    • http://jokosen.atwebpages.com/briefly_summary_the_story_of_odysseus_and_polyphemus.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/48592253188.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/gulogovekiwofedolodef.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_75e51820e3a74884a6454d0cb43c45a3.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_011491f8b7bb4e048b64b8236af5cda9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozaponi/navy_formal_dress_with_black_shoes.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_98c98f7266d941bb9d32c73e35605188.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_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 5528 bytes
SHA-256: 6bdfa54b1ce068fb2ea9256b0c5e10fff8814b01615b879f8e81717dba5731b5
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11856 bytes
SHA-256: 92c6e8196fd847d09a053ac8511306d793bc557cca7db22b12b914299c6f4311

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