Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8666aca1d8d5904…

MALICIOUS

PDF

76.0 KB Created: 2021-03-27 21:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a868a2a96dad4db244c0477704baa82 SHA-1: e87bc03017979133fc5ca3488e712ddddc65537f SHA-256: a8666aca1d8d59049b3ebcf1ef923d1a1b0ea2ef0bd0383fb209bf5426a0a101
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/aws?utm_term=how+to+use+a+stovetop+pressure+cooker PDF link annotation
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/rikidamudunimadoz.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/machine_learning_book_stanford.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/zumodirebakakineroraw.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/fujej.pdfIn PDF document text
    • https://dinofewujib.weebly.com/uploads/1/3/1/3/131379591/vufogirixorajax_navube.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/blender_2._8_tutorial_download.pdfIn PDF document text
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/a7b8d2bfeb.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/nuvozoropilewu_bosotikitam_naror_gaparusunu.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/html_file_input_only.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/fasomusogapovi/67664898220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6fcec16-3501-40e3-bf39-f403fff54918/how_to_turn_on_acer_backlit_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/sweating_superhero_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/cordoba_spain_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/britax_car_seat_shoulder_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84134e7d-6e58-42bc-855c-25b6608a87c7/baxudot.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/23781209811.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/43319030369.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/77654697614.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/42913583509.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/89829865690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c536fee-b174-436a-9e56-2f9346c08580/bejobetejaluwosowonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7bd4c8-ebff-4ccf-8908-6a01361b9305/81331014655.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_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 5072 bytes
SHA-256: d5c3c29365694108de9d6c9dc8f81edbf150c1c7650b9fab703fe8e82491eb68
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10628 bytes
SHA-256: fe2b7b0e0059d92d69aab159935f1dd3a9df18411bfbb3beaa34fcc4d308956f

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