Malicious PDF — malware analysis report

Static analysis result for SHA-256 3844d15f903c500a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 07:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 373d5fa7d28b3ac1e7e379b5c67882c8 SHA-1: 51afa86509f41427c47eaaffb5dc1d042430d3c8 SHA-256: 3844d15f903c500a268c69dbb74e034cd19f620a089bd54e0d96c5b7f302f46b
96 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 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 0.9998

Heuristics 4

  • 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://ponafet.ru/award?keyword=samsad+bengali+to+english+dictionary+pdf+download PDF link annotation
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/799173.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/vimadut_malutigunuveli_gipoxopapozoril.pdfIn PDF document text
    • https://vimebadexij.weebly.com/uploads/1/3/5/2/135295776/7157072.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/fgejc7q/zumobujoxisifagek.pdfIn PDF document text
    • http://luminar4-download.xyz/cub_scout_bear_den_book20onn.pdfIn PDF document text
    • http://how2clever.com/bovegexikonojojmprox.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/SKih7ur/65641700502.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/GBR5Ejd/marvel_stadium_ufc_attendance.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/sibijm1/sotuxarevik.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/lovomijelun/jowopevolijesovugefo.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_38fac2d46cfe4ed5938a38a9d5cc3576.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15f8c18-a822-4c44-bda0-5d499828f4b0/text_detection_image_python.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_to_adjust_the_carburetor_on_a_poulan_2150_chainsaw.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/wutidizulo.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/gafelekuvawopelokemike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df386643-803b-42a0-98e4-28d5a0f2652a/65947747629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec24b029-8d07-4c14-93d0-c8567b7be0fe/gogetuti.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/kiss_the_rain_violin_sheet_music_free.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_418b62bc1310485a91274ad5889ff665.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_cbe47b927d3440fd87524375d8ef0da7.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 6008 bytes
SHA-256: 286e79c7fed0f04de61b42e742dd13d0763d5f8797f20352ce468c2bdab686ba
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 4392 bytes
SHA-256: e92c8f27991deb7897094bd492d5bfd67f4fdd1661657a0404711675ad5e22aa
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 11068 bytes
SHA-256: 0541a86ec752caefbb03772f649334be5f8efd5a7005d0536c6a6f3cae953284

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