Malicious PDF — malware analysis report

Static analysis result for SHA-256 510ce2a51dcc0486…

MALICIOUS

PDF

86.4 KB Created: 2021-04-07 09:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d714802db297c2b662825fd1afc54b52 SHA-1: da250137402d11ef1dcf51b4ddec5fabaa888bdc SHA-256: 510ce2a51dcc048681f44d7bc7152162f6979c3c9c46f76fd81834b3d1aeed58
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The embedded URL and the nature of the heuristics strongly suggest this PDF is used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=how+to+clean+the+wolf+steam+oven PDF link annotation
    • http://kobazugipodiv.medianewsonline.com/29516496370.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/vowida.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/kutitewijokokolep.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://7e19c1c2-6675-4e4d-baed-802c948efb6e.filesusr.com/ugd/e5a943_655cef60cc564b90888b17a08989c939.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/kirelovilavesa.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_5e37a3d011fc42d1800c5ab77a01a8b7.pdf?index=trueIn PDF document text
    • http://xufoziminep.onlinewebshop.net/kakuvegela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f24df7-9b08-4264-80a8-1a1b8e939a41/mobile_car_air_conditioning_service_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445b3b14-ea7a-4cac-9e2d-4b71637146fb/crossfire_series_books_like.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/58456903503.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_74b83e12278e4cb48e423f6103b1e966.pdf?index=trueIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/list_of_legal_abbreviations.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/what_are_the_common_problems_in_writing_a_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a60a50f-e423-41a9-af67-667e20a839b8/72030924979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bac1ee-a71a-4ab3-8f11-e3ade9cc03f8/57711082368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6515e7-ec60-422f-a9d1-938f3dca039d/katadamimazuwaragitifet.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_45d3dbf1a0b74a129686e2489c4a83dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08adfad-c19a-44b3-9720-549b2454a608/69564775171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e4c3e3-845a-4d96-b714-97d038c5f497/what_are_the_data_analytics_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72fd52a-6344-46a2-95d1-52c423f8ff34/unlimited_power_supply.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012263.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12263 17996 bytes
SHA-256: b317351352d68d15f2a5b2c3fa2b758f172c423f948b8e3edada04dd2c6bae7c
font_00_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 4880 bytes
SHA-256: 0967e0affa240822f5f31fe2f9ed47aeb0f65ca094041a9ea07f3ff194104976
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10432 bytes
SHA-256: 27b97cff2b9a6845b26103c99d8c8c7a023eccef0a7f1b7e21ba78c819570726
font_03_sfnt_off00013dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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