Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38ebc8262bc5be0…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 12:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ce27dee9b2fd397f82875c7af590867c SHA-1: da5e475a7c3bdad4962699854323383bfa864aa3 SHA-256: e38ebc8262bc5be065089ee44153bf753b1381786b58126d3538f2add5d431d0
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=literature+reader+class+7+pdf PDF link annotation
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/3229741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f91e644dff1d.pdfIn PDF document text
    • https://sasozepawises.weebly.com/uploads/1/3/4/3/134315695/sufixaradagaru.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/fb6e1039764c7.pdfIn PDF document text
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/vojebewituvemomase.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/7040069.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/91c7bce6-2789-43b7-86a3-b6ad844facc1/tubemate_download_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/classification_of_antibiotics_based_on_chemical_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6f9976-fde2-4b22-b453-3222d771884a/84956197778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7e9b26-24e1-477e-9af8-d6fbcc065389/60521780659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1150ed80-814a-4fc6-84de-3e146479b46f/38690444397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3b23bf-55cd-4f3a-bba1-839b295d49cb/74172606379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b8ad20a-b9fb-4715-aa70-066956a967f3/chemistry_chapter_1_chapter_review_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8751adb2-fefb-465c-ac76-529672ab71c9/xovoj.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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 5168 bytes
SHA-256: a5c1fb3a412d933e807a26ca5d1355a6512c7111738f85044430e8300ed4af34
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 10404 bytes
SHA-256: 73fff0a42c24ff5d92f95ad357227818a577c127db2d472046f1d4ca3a7273f6

Open this report in the interactive analyzer, or submit your own file for analysis.