Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1f7398eaeaf446…

MALICIOUS

PDF

86.2 KB Created: 2021-04-02 23:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 72cc68c780116b5ef7e814ca2ed74f6c SHA-1: d3a384ff9e096fd51e3da24da3f31d5e03594c63 SHA-256: 6d1f7398eaeaf446dcad0f1f8128fe3f3d4f94dc74f73bf910b7d174ea3af9b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://resalured.ru/123?utm_term=beogradski+sindikat+album PDF link annotation
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/diwina.pdfIn PDF document text
    • https://nalujedadi.weebly.com/uploads/1/3/4/5/134514722/410a65.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/aaos_knee_strengthening.pdfIn PDF document text
    • https://mowejeli.weebly.com/uploads/1/3/4/6/134672800/nonulix.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/c33b9b874a.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/9709c5a4dbfd0.pdfIn PDF document text
    • https://rekeboko.weebly.com/uploads/1/3/4/8/134899800/a0cdb75b331e6.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/58854852080.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/7624f8.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/davawina/summary_of_after_twenty_years.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012e3f1e-28d1-4ff0-a273-db3344d9b125/which_english_grammar_book_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeade111-7ed8-464f-b645-41523576ba2b/ford_mustang_ecoboost_horsepower_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/adobe_illustrator_cs6_crack_amtlib.dll.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/pojesugapopozexixazune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91aa69d-59ba-4134-8953-4ccc5444166d/how_much_is_navy_salary_per_month.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7d2b23-b055-41de-abb1-77d7ec9c7110/kikeb.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/how_to_adjust_schwinn_bike_handlebars.pdfIn PDF document text
    • http://gipetiwivi.atwebpages.com/58293967868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc164b2-bc8d-4caa-9d3f-0489704b78f2/21388338709.pdfIn PDF document text
    • http://zavulelobawabi.onlinewebshop.net/executive_administrative_assistant_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d335a81e-e885-48b2-8fad-f0185f0ac51a/berelisatufidurode.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/lepixozex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd1af33-2238-4a63-9ea0-07eaba35073e/12150557789.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_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 5280 bytes
SHA-256: c620166ddedce85228dc8c9e2a101c48fa17681db3d44644370209ee069c9ce7
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 11224 bytes
SHA-256: 2855caa298bfcbed3d3681ddf4de336be4859b6b5f64c92365fd78cea2c6c918
font_02_sfnt_off00013d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176