Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1bd3b7776b8d45…

MALICIOUS

PDF

74.2 KB Created: 2021-03-11 17:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57ca22cf2534633a40b154c9c12bd5e5 SHA-1: 90bb69a4d02486d6a42f63b4d4eb571116b554b8 SHA-256: 8d1bd3b7776b8d45dd0f719bdd93438eff22353e3cd89a75fae106834684dc6e
186 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=apache+license+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5ff791b4770e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ffe4caaab60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_601ed1a96884a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6035670ce54ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5fc62d7e43859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_6012d8a852de4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5ffbcb9673cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_6016cf534349a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd641414dda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_603344530697a.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/ddbdd088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_603c779389af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_60469fef3797d.pdfIn PDF document text
    • http://bagagom.22web.org/what_do_you_understand_by_design_response_spectra.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/6964188.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/kewirukuruvo-zotimi-kijapikek.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/ramiremulesowuge.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/1b9baefc-573c-4821-872a-844ae89fdf3a/hp_laserjet_p1006_driver_win7_64bit.pdfIn PDF document text
    • http://rivubutapadagar.epizy.com/zolarokadepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d20e9b0-bf95-4a6d-b10d-d3ed67cbac49/hp_deskjet_5550_ink_levels.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5136 bytes
SHA-256: bffcb6ef996df5547e94d647ff1a86e61d08f05b0c133bbacf8f68bdd86c7725
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10252 bytes
SHA-256: 0ad9a708bdd3c8a9c07efebf1ecb6c8b4351718d48bdb12dd44d508b63ef77c1

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