Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bca3fcad3f0f591…

MALICIOUS

PDF

72.9 KB Created: 2021-06-04 23:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bb84fb7f97f8f73a39c16388966901a8 SHA-1: 4aa1dd63e93df85eade69391254fadda2f81a8b2 SHA-256: 9bca3fcad3f0f5916b2375f5f54a6999aee40adc30c9241e83abc31fd74d3cdb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting or unknown domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate a strong likelihood of malicious intent, possibly involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/pbw?utm_term=autopage+c3-rs+730+installation+manual PDF link annotation
    • https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/498f7994c725.pdfIn PDF document text
    • https://dopozagipixa.weebly.com/uploads/1/3/2/7/132741545/52c44155aa3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_60271565263fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_6014dec814160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fddb46170ca8.pdfIn PDF document text
    • https://fofevupug.weebly.com/uploads/1/3/4/4/134490210/7871192.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/c853d9d5-a776-4ed0-b9db-8b0f5f96c363/wawidotikazipam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2c6599-694e-450a-872d-6dfdf087f5fa/redopegerowugoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9c0c77-3eb5-4b8d-b8ee-47e97279d2db/mevodujibedibumilobedaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71846ec-b1c8-4f75-9ffd-917b5e9b8bb8/double_cross_algebra_with_pizzazz_page_129_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a621fe30-8506-4a74-870c-1ba3df58069a/future_english_for_results_4_teachers_edition.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/jlpt_n3_kanji_practice_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867a19da-3e44-4a17-8000-e4248cb516b8/lorasefewopade.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/xbox_one_jailbreak_usb_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d22291-3c7b-4c14-9f33-430afaadac14/32564573708.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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 5660 bytes
SHA-256: 364e99b5d7c50fc00ecbf0c12147e9370a7a1b8e1fc490578188038368a43bad
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10568 bytes
SHA-256: 74a8f9ee990b532205e7beb988118133681b0d9e914d37f229ad7d9779bc9531

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