Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7d5569bdda891d…

MALICIOUS

PDF

70.6 KB Created: 2020-11-27 21:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 961e9659171aa281fc3c8fbb4a52835a SHA-1: dcd72a0be45e82eeb5c381d9c93634d2af0ba921 SHA-256: cb7d5569bdda891da9be65647a7e6eb5a076b0aa998317b0393dcb4a50dcb924
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-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://traffine.ru/123?utm_term=apk+hotspot+shield+premium+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f8fb17fe60e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5f9a3944ae199.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/48f7fbf57d5b.pdfIn PDF document text
    • https://mojeleku.weebly.com/uploads/1/3/4/8/134862936/3073980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_5fbb3e999b86f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fa07a17c05d9.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/6ededc55f8.pdfIn PDF document text
    • https://buvojitode.weebly.com/uploads/1/3/4/6/134630820/7503800.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/9866e756-bfab-4805-8d97-91c56750848c/zibifikajapikivabefur.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/lovevery_play_gym_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a32dc94-969d-4eff-951f-bf4df7a1ea23/24429304147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeaeffdc-6fda-4668-9b04-ba084ddcfc56/92194238293.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/tiladudiwowunoxosuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09fce35-e360-49d5-a09e-fc19d643e0b6/jaguxotanufapoluleve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c309ee-e118-4f84-b12a-a5a3511de4ed/97356104302.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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 4900 bytes
SHA-256: 7aeea5b78177015d5b6cf1e8c2f0bdf235f3018008b8468658d6fc39efd9a852
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 10116 bytes
SHA-256: 105c18c6629fb15a51525f54417c377bb378146c0b3e06968a9a4b815207cedb
font_02_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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