Malicious PDF — malware analysis report

Static analysis result for SHA-256 5815317effc79a1d…

MALICIOUS

PDF

67.7 KB Created: 2020-11-25 04:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9f187bf068399021f6225fc3d200f41 SHA-1: d69d701a5035c0007e7a850d07040f766580d12f SHA-256: 5815317effc79a1d5e498a113da09882551b2fbb2523978d7d4aff3470af885f
156 Risk Score

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://trafffi.ru/strik?utm_term=white+pages+pittsburgh PDF link annotation
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/1000477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5fae7d3975df6.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/mewesan.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/044dfdd0190b5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fa0ed766de73.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/fb6e2a.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/lovew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_5fb33c090b903.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/e5c469bd-2f80-4b4e-80b6-e26e2c2762e3/gattaca_viewing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e19c62-4607-4d7e-9a47-5a3603975279/1777606968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb050ba-9cc2-41be-8279-7fef64df90d7/zf_5hp19_repair_manual_audi.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_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 5200 bytes
SHA-256: 7d8234bcc4e9b6e07e7fa79c516f15b2f726c62fb43b75b04dfd51b38f386ca0
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10912 bytes
SHA-256: 56850edfcd85c365d5fe29a3f60b8fac823b0ffe3a7ebd562507a80dab394133