Malicious PDF — malware analysis report

Static analysis result for SHA-256 242e26b64a38b3af…

MALICIOUS

PDF

73.5 KB Created: 2020-11-10 01:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6f4a503ebb91fb6cce401e93cc42936f SHA-1: 2fe266b5c07e6560feb135877bc1dc8a2a851804 SHA-256: 242e26b64a38b3afb5f44e345dfd488a5a40d0b6d128a06aedd477cb6ddabaa9
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-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://traffset.ru/123?keyword=cooking+fever+apk+for+computer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f9132ad2b3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fa63af73c368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f89fa683145b.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/5088566.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/zilojesubowax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_5fa1a6027446a.pdfIn PDF document text
    • https://sitawixabebel.weebly.com/uploads/1/3/4/3/134319036/25c58916b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5f9984ea2c81e.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/9b8ed4c8-a04f-4b86-ab2f-51da3e694bf4/nenanetepigafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a4beab-c06d-463d-bd82-dc28698e54aa/somorakoduvitukeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/user_manual_at_t_cl4940.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/84919655085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb65701a-4775-40ca-9df8-0f616d38e83b/56898915387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e05aa6b-16c7-4ebb-93f0-697bf0689491/74544146079.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 5156 bytes
SHA-256: 4ef30ba819a328d5ae5a29cbe659062aaf38e0f486d8b68c1f1487e4d03247db
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10452 bytes
SHA-256: 65bd8e58c8f8b7ca4efae3eac7a9d2740abb4b92cbc4a1307eb22190006f449e
font_02_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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