Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ab688129fb4f4a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-09 04:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ef095d3e6ffef326ce771613f534a10 SHA-1: 21877c9db67954b968207d3cfee5d226f5c84d6a SHA-256: 11ab688129fb4f4a6b78dd61aa3c4ba6771019c34bf0ec3b3eab13f288d59c8b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest it's used as an initial vector for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=fuel+consumption+guide+canada+2018 PDF link annotation
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/2685456.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/5698184.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/76f805212.pdfIn PDF document text
    • http://creditreportfast.info/international_mail_tracking_numberhn046.pdfIn PDF document text
    • http://50offstore.info/clumsy_synonym_informallstav.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/edb6dd8c80c74a.pdfIn PDF document text
    • http://fruit-italy.space/microeconomics_in_modules_3rd_editiongxgdf.pdfIn PDF document text
    • http://menbp.online/christmas_nail_art_stickers_uk5s6ul.pdfIn PDF document text
    • http://exampl1214.com/51883626820gcrrr.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/english_vocabulary_with_urdu_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c01eee-0b26-4687-a711-c552d5b881f8/young_life_sin_talk_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/68100134375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af8cc9f-f0fb-4b94-a830-6591baa62104/zawovaripikutabefupijula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bf447a-aba2-45f6-a00c-b94441993dab/sharepoint_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df61a2a-9e8f-4bda-bbf9-e0301b189bf4/computer_dummies_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5926c60-5b30-472d-9875-b3ec4bed6538/zefuletafarefodexibema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb73e81-bd28-47aa-9947-3f4286d88dd5/xajeximivobixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/kuwasaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcaec8f9-6352-46df-80ac-38edd9b5917c/large_dolls_house_furniture_set_bundle.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/briggs_and_stratton_parts_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/xilajebuvuburozinuweb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 5772 bytes
SHA-256: 03b89b7ad23762b5e18e5703cce2483b58fe6dc33d3e78574f8f7f27bf8bbc62
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10856 bytes
SHA-256: a07bb2232c7387b192e335ade9d9cfc0566fb59484df4cc1058e09c1ea446a1d