Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0da1992a26bfa6…

MALICIOUS

PDF

45.1 KB Created: 2020-11-05 20:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: d924bbdfca4b4b7994c06242fcdb5719 SHA-1: 6efa86506148ba3963ee5bb98ed40a1ea9af9d2b SHA-256: 7b0da1992a26bfa6e162817c882028db14c0130593153f27a8b1822b32b302ce
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafficel.ru/aws?keyword=paper+mario+color+splash+roshambo+guide PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.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/9f5e548c-56ce-4e03-9a86-3dcb013a4a60/bmr_answer_sheet_sea_cadets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0fcbf9-47db-4622-8fe1-6e0a68788883/98422923790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1409d9b0-f346-4e29-9c51-9c7340c4970c/wekaruwasovi.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/56544994733.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/martin_logan_dynamo_700.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/26706036266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a31a93-d723-4105-81dc-6011f632111d/96175922041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd65a5bf-dc83-434e-8622-3a4b730fdcd3/jarugisegunokoleboxeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68967e06-efbf-4b3a-b1a7-0ea44f3616ca/72977905743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d189c568-50d0-4de1-98a2-41b1af27f2f6/60316602789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60100f0e-5a8d-47a4-add4-90aa3907bc31/91050371663.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EC 4080 bytes
SHA-256: 7516dd48136ff6ff11f0807e7f24bc3547233a18de663578a5a38b159d3e99b6
font_01_sfnt_off00007153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 5628 bytes
SHA-256: 6881d10e8d784814ad743195a8de14b42f64c29af08623b6342b6d8a2a32f900
font_02_sfnt_off0000843f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843F 10148 bytes
SHA-256: 51e933d2b4bc283e3d2f6ba11d1c1ffe9e81dcbe04b3d4db5c1443f81b41b730

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