Malicious PDF — malware analysis report

Static analysis result for SHA-256 89636390117514b3…

MALICIOUS

PDF

79.2 KB Created: 2020-12-21 20:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 970705182e9a61e186160be8577bac9f SHA-1: 973db67691cb785d54697c555d03b97d1882b707 SHA-256: 89636390117514b3e08316b4dee0db20699ab71870b62fbb44a7e718d933b70f
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://trafficel.ru/aws?utm_term=dominoes+game+app+for+android PDF link annotation
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/vufovebojokunid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fb4600de7824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_5fa36502712ff.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/vezosoluvezoj/muvep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1057f405d5340f32a3beb/t/5fcd1e291e1a4d7de131d19e/1607278124507/52141444541.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/riderufalavifi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc783de43c5ee75bf2ca8b2/t/5fccf9ce5d2e6f3bda3f0967/1607268816017/assistant_principal_jobs_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/sedaruronufudazogeneja.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/6043399065.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/love_of_my_life_piano_sheet_queen.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/33412636243.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/calories_in_food_chart.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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 5036 bytes
SHA-256: 835e8e7f6d217e8b04995975e826348b04a737e4002921193d804178e513e833
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 10556 bytes
SHA-256: 85803ae4a846e1554f9ff5cfb665340efeddb1fb16fd4cd5c7c657d0c5af85c3
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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