Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ae95ef7a5fc2f2…

MALICIOUS

PDF

75.8 KB Created: 2020-11-13 07:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1741bd7b48c10521e0c4147e6e266e42 SHA-1: 9bd0854069cee5b9d42426847015353b7b1078e2 SHA-256: 81ae95ef7a5fc2f26f8c7e755dfbb29ce45eda6204f2dc77feb64dcc2075a3c7
156 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/aws?utm_term=bukedde+tv+app PDF link annotation
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/veperinubojami.pdfIn PDF document text
    • https://mavulirapiba.weebly.com/uploads/1/3/4/7/134741644/1106284.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/negin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d291b38-717e-4665-b0af-108d21ea71e1/92640329708.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/8917954481.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/integumentary_system_worksheet_packet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d8597e-f689-4000-b8c7-f224dcc28b2e/43482241395.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/10917460381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877dead2-7c29-4f78-8c6e-37f0b5a5050e/foxuzaxaradaniwuzuxikidon.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/guide_gear_teepee_tent_18_x_18.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/potafutowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23b2cc5-2720-41c2-b006-222f3cc020f4/15490069174.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 4436 bytes
SHA-256: 0a0e461f8db27219a1d5f98b8c82d148cad3591bb545fd61212e1547d2c8e359
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10888 bytes
SHA-256: 56ad4cfb61c64a66380fa1aa90c29db7a1e4e79db3390383806e0448a28e343c
font_02_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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