Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93e339ffeddff70…

MALICIOUS

PDF

65.8 KB Created: 2021-03-31 01:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 146a052c058cb93a409aed3470d7ce3b SHA-1: 84e5907fde5b6a93f2c17c22f8c08522ab32ad3c SHA-256: a93e339ffeddff70bd1f9e1da2a2ef834ef396ffc35785cd09e93c553ded4e2f
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 0.9998

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://jacksth.ru/award?keyword=integration+of+trigonometric+functions+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6059a22179ea9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5ff0b0a1bb07c.pdfIn PDF document text
    • http://giviwopifa.22web.org/povukiwulabo.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/db621cdd-ab43-4819-a2bd-4025efb6786f/how_to_put_plantronics_voyager_headset_in_pairing_mode.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_3e50ce4c032c4378bad8f9b2df59c769.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_a0bb957d1c5f421788bed5fd8edf1ad8.pdf?index=trueIn PDF document text
    • http://tojegazanet.rf.gd/renaissance_periodisation.pdfIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_01c9f108019647cb8b49efb16c71955e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b597795d-983b-472d-933c-66f84faaad8d/puzowolakibubamudosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28937e7-7a75-49bc-9411-59bca7906219/common_verbs_in_english_with_hindi_meaning.pdfIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_a429db63e982476f826595f658a1407e.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_aa6f5bf5b6254b2ea5b16027cf81d6f5.pdf?index=trueIn PDF document text
    • http://lexaxixamu.rf.gd/role_of_nurse_in_critical_care_unit.pdfIn PDF document text
    • http://fibajufe.rf.gd/ejercicios_de_lectoescritura_para_segundo_grado_de_primaria.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_18b5f09394b34da0b4865c8da4044b74.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_4a98a55d79df4b5fb87d04a5b5884147.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89368fca-1eff-459f-970b-adf01e60a9a0/89736398093.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_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 5632 bytes
SHA-256: 503126e949caf24e3bd70738700b2e0d7b275a41e0955bd4896c45b9159a6fc3
font_01_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 9976 bytes
SHA-256: 30343a9eaaee18be8cbb0f4c0c55d981385976bbbc9407b935bb1796b0ae73e0

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