Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c43e5828830e87…

MALICIOUS

PDF

78.4 KB Created: 2021-04-28 20:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3ba2f4d0b6e72eda3bcdf937c726dd87 SHA-1: 29ad212116aedd763a3cbc65fe454e9f3e6ea564 SHA-256: a4c43e5828830e8781de2895a7df3d78961c5bc3ba37faec4d9ea96a3e33251e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various external domains, many of which are hosted on disposable platforms. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or spread malicious links. While no scripts were directly extracted, the nature of the embedded links and the PDF structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=why+won%2527t+my+gas+fireplace+pilot+light+stay+on PDF link annotation
    • https://nilemesobipefuj.weebly.com/uploads/1/3/2/3/132303022/95aa2a9.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/2ffc51.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/QjagLZX/ball_sort_puzzle_level_159.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ijtjeQ6/cs_driving_natick.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_606cad84e77c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_603a10f11a689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380890/normal_5fc61c566ac02.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/gghcBg7/vertigo_movie_character_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_60669b63b57c8.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/hjPDqqJ/sepezavedebadamob.pdfIn PDF document text
    • https://tamejozapana.weebly.com/uploads/1/3/2/8/132814544/145639c4d04c8a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fcf5e1344dfc.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://s3.amazonaws.com/jasipefulaxiduj/sunbeam_microwave_sgb8901_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/midwest_industries_ar-15_m4_stock_wrench.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/football_field_valuation_chart_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932abf61-cccc-48e7-a28d-2817d7ade53c/82540530454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959c5ae0-179c-419f-9d39-aa8aee1a1744/kenokadagul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 5456 bytes
SHA-256: d1117e140b5841c2d3084ee98442f311a8c194d11601cbb172de3aa32bfdd6a0
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 11028 bytes
SHA-256: 51b0f5a3a1cbe3bdcf9b848a89d1d2fe0b0907563d0bb3bb0c41c5259245d68f
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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