Malicious PDF — malware analysis report

Static analysis result for SHA-256 13648c4b627be7d7…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 14:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67928b83b4e655c99812f7ad8a84952f SHA-1: 73e425b7ec2017606231279587d55e23dfb67296 SHA-256: 13648c4b627be7d7677ea53bcc512d19c53d01b0a526e173d7ad258e16798aee
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files with numeric slugs, indicating a link farm for SEO manipulation. The primary external URL, https://botokaw.ru/strik?utm_term=go+math+grade+3+workbook+pdf, suggests a lure to a website disguised as educational material. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an intent to redirect users to malicious or spam content.

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://botokaw.ru/strik?utm_term=go+math+grade+3+workbook+pdf
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/gazumo.pdf
    • http://bazunujovi.scienceontheweb.net/puxekunetajawafubaxelu.pdf
    • http://wamipivifubape.sportsontheweb.net/dibedekuxabevafarazizur.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/2749651.pdf
    • https://rajiketuwomap.weebly.com/uploads/1/3/5/9/135957261/6820351.pdf
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/0557e6499bb.pdf
    • https://jaginozowelizuf.weebly.com/uploads/1/3/4/7/134729204/wazur.pdf
    • https://nigoriwidoke.weebly.com/uploads/1/3/5/2/135296580/vejozopazejaga.pdf
    • http://sepukolobu.sportsontheweb.net/abnormal_psychology_10th_edition_chegg.pdf
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/5331840.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f06f437-74e3-41a0-941e-24b7efd0c078/62318897526.pdf
    • https://uploads.strikinglycdn.com/files/d21fa954-3fa9-46b7-bbe8-195d66d59b32/why_was_the_berenstain_bears_cancelled.pdf
    • https://s3.amazonaws.com/vuliwisuwig/ti-36x_solar_ncr.pdf
    • https://s3.amazonaws.com/bizamesuwepe/dc_metro_map_2018.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_85446ada5299419f852b86d61b91788d.pdf?index=true
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_79f7221a8e54447d9b5c43ecbf9c2ac7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8003e20c-ba97-45c9-ba91-929590fdda5b/how_to_replace_whirlpool_refrigerator_water_filter_3.pdf
    • https://uploads.strikinglycdn.com/files/d331fdf9-a1e8-4a58-bb53-9a95ee3ac688/56523429000.pdf
    • https://s3.amazonaws.com/lososimap/64242458672.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin
b0e8a5380d247ef1b245b3927caa3c5889f37f6bab1d9051fb5d161306012b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5736 bytes
font_01_sfnt_off000100bf.bin
088bb6832a15d363c121d9c1879433013eb7d185e27ae9b58568cebc6a972778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 11404 bytes

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