Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f906a4667b21b3…

MALICIOUS

PDF

86.7 KB Created: 2021-04-01 20:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a70e3f31b8b8c4f124472e9f2a472014 SHA-1: 7b837f29cf3baa371fb37813a19767a6cd7ea9ba SHA-256: 16f906a4667b21b3bb49af442ea95d218effe0bd4bebaca72ce3fc560337da62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, with one primary URL pointing to a domain associated with malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing lure related to financial topics. No scripts were extracted, but the presence of multiple external links and the overall structure point towards a phishing or scam campaign.

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 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://bologen.ru/strik?utm_term=penny+stocks+to+watch+tomorrow PDF link annotation
    • http://dojegegitotebe.22web.org/probability_questions_for_class_10.pdfIn PDF document text
    • http://gepatoxax.iblogger.org/nomirodebajufosinizuluwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_60583788a2606.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/medical_acronyms_and_abbreviations.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5ff9a5569f2e2.pdfIn PDF document text
    • http://fanewixijek.22web.org/millennials_lifestyle.pdfIn PDF document text
    • http://jefigesawek.iblogger.org/aqa_a_level_sociology_book_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/xesaximuraxalor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8111453-50dd-4638-aa12-8fbbabdbc926/char_griller_bbq_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833f7c18-5e98-4785-bf19-21b9a118d70e/89125201743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2eb4cfb-4f18-4347-a61c-d8ec9bff78e5/tolajixevuso.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/luvepixivezabokotir.pdfIn PDF document text
    • http://winivufada.epizy.com/67805648825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb16fc8-3ebb-4505-8f6b-b39ee812a57c/reflective_essay_example_about_high_school_life.pdfIn PDF document text
    • http://welojorolepone.rf.gd/arturia_beatstep_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b57b59-8e88-4435-9523-7e37984a3e29/pigafolotuwole.pdfIn PDF document text
    • http://kobizesamow.rf.gd/25086539756.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/17835734407.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/6587417527.pdfIn PDF document text
    • http://xatabiraluxuded.rf.gd/excel_duplicate_cells_between_worksheets.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_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 5264 bytes
SHA-256: c263a1583f88ac837d9d2c464c13e42eec9ed8131b368b1c0bfecfc28aaa68e4
font_01_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 11584 bytes
SHA-256: 57f11f95ebc339dd371cfe2abf65e6c206e93c3226e60d8bc3ddf30447e7feee

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