Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c157ea653ce4df8…

MALICIOUS

PDF

79.6 KB Created: 2021-03-17 10:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 522e62bfaa03f6b77fb462a208bcbdbc SHA-1: 8730213173071b2c4feec749de96dcb8a4b19b0c SHA-256: 0c157ea653ce4df827053fa6a60ff3f57021f069e7df404ba23ed5c7e439251f
126 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a link farm on disposable hosting, directing users to a suspicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a social engineering attack to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=qooapp+apk+ios+download PDF link annotation
    • https://cdn.sqhk.co/modebopogut/imib7hh/tenkyuu_partition_piano.pdfIn PDF document text
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/cf3fee270f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_60210705bb826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_604a578cecfe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5fdd3377a603c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fdf7837937a3.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/qGUhije/real_followers_check.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fe53a0869dc7.pdfIn PDF document text
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/08f2fc189.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/gegitazigazetenawo.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/eUhdvje/boba_unicorn_run_2020_cyberjaya.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/djjdiiQ/nolofonopatutur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_95aafd827e0a46138a79d7b32c060787.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4fbb51-9276-4700-808f-f8ed6a23482f/danielle_steel_books_in_order_written.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1236ae-44fd-4917-ab4a-bf0d0e7e7a29/rodanukipolobimutevex.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_a5cac9d726b049069ac6cd4f538e7f7d.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_991446525ced44eb82143520f6e4a442.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98741b73-7c44-4800-821a-6e45ed140b74/what_books_are_excluded_from_the_protestant_bible.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_5a185f95afc64e5c89ab98c65458a01d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/421ffed1-fb93-4ea1-8a6a-27a96acb484c/is_hbo_max_on_firestick_lite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0104757-049c-464d-bbce-d36808e16626/39432664364.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_a342a963c38e4e2195ad5a695c4a766b.pdf?index=trueIn 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_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 5072 bytes
SHA-256: bcf1a8b4c56b1ba70568ae80863b013435d1ed4881cf80b8ce06020862e0da67
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 11164 bytes
SHA-256: 16b21d4bf485d74a39ddb80506674508ceb7e9784792f91d12b49ac96447aeba