Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb07579187d7a59…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 00:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d5abbac5535ff8d7a39e396c41ce62fe SHA-1: 63e84a418e73ce5472b3139a4f396ad03a77d3da SHA-256: 1cb07579187d7a59f32f8ca1db55c0918eabc3a2bd8e4e6f86fc081575fb90a8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/aws?utm_term=flysky+fs-gt3b+reverse+throttle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366655/normal_60313042ed5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fe987a87b95f.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/JUjdIuo/free_streaming_music_for_twitch.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/dexeteparaminakuveda.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/ifire5x/59512552743.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/liraxibikevul-raginorividar.pdfIn PDF document text
    • https://lefukumot.weebly.com/uploads/1/3/4/8/134887275/2761310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_6000b970ebe39.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/MjbifzS/divabas.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/GUbigjh/where_s_my_water_3_game_online.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/xinof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixadamobus.epizy.com/defexibanajakubebidiworo.pdfIn PDF document text
    • http://ropipowewigu.epizy.com/rufiloxuj.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/56833296562.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/double_entry_accounting_spreadsheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/answers_to_crossword_quiz_animals_level_4.pdfIn PDF document text
    • http://xumidexasij.epizy.com/algebra_and_trigonometry_structure_and_method_book_2_houghton_mifflin.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/91381019147.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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 5336 bytes
SHA-256: ddfcd1ac0b62723c98875e44c366fe25a0e6ab8f51b14fe587b3c2108a7f6285
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 12032 bytes
SHA-256: ac3629bf7741e822cf056747ab75cc9a607a6278a3ee5485474e168e07faebbc

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