Malicious PDF — malware analysis report

Static analysis result for SHA-256 b525fea93d9b2546…

MALICIOUS

PDF

69.9 KB Created: 2020-11-18 05:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 10e894cdc0e7e02c9fa00fbfd08ae947 SHA-1: d9b648844663a05a3762c8df283afad946165d98 SHA-256: b525fea93d9b2546d6501ae78a1ec71dd3f77cb7d281c8fc89bd54418405e31f
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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=algebra+functions+and+data+analysis+a+virginia+course+textbook+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fb4832ca72a2.pdfIn PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/371486f20.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/ef865a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f975e1a7cb89.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/2b37d8a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_5f9e970fcf873.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/4cb5795817126.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://s3.amazonaws.com/bejideba/14411294544.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/gameboy_color_roms_mania.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/6415974934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a8ca99-5566-4770-8c06-a63cc39474ce/nosup.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/bejeweled_twist_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/nimazofuzusuw.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_off0000c6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E3 5584 bytes
SHA-256: b1277f05a2b2eff1311c07954e4f9dc86f5f65f11a230c37e9c7222cfcd290a2
font_01_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 10052 bytes
SHA-256: 82e5377b4240a453d35392a1f6d31a7276d35c3412eb362e1c093688c5bb2bd5
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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