Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b7f0822a61a28…

MALICIOUS

PDF

73.5 KB Created: 2021-05-02 04:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2320daa8bcf885f70b834e8f69dc606e SHA-1: 72ed1501b5991e8bf5c4cf0b0d15252f6e97cd4a SHA-256: a81b7f0822a61a2800537a1f343b547b3d3e8a32ef3278b6544810c2bc539cb5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, as malicious and phishing-related. It contains an external URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's designed to trick users into visiting a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=romeo+y+julieta+1875 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fcb7d39869f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6042a94ac3eda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446937/normal_5ff2bf7fc8541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_6042192bd7840.pdfIn PDF document text
    • http://netabemoli.22web.org/andreas_moritz_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42aeddbb-fe56-4004-a29a-a11a49978955/alimentos_y_bebidas_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18672027-a0fa-4a5e-a407-74b619bd7f22/the_danger_of_a_single_story_ted_talk_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7266224e-2d8c-48a4-8f00-0716e8bd4169/big_little_lies_trailer_deutsch_vox.pdfIn PDF document text
    • http://residarifuwus.rf.gd/87270047090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb0eb66-54a9-4680-82b3-8c9c82b22f3f/campbell_hausfeld_airless_paint_sprayer_2_3_hp_.40_gpm.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/11638848553.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/22321401172.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/lepelivubetudex.pdfIn PDF document text
    • http://pexevogawi.epizy.com/best_spy_video_recorder_apk.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_b8faab31b9854b5eb18d4eb50839f933.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d6da3f-496c-491c-9c8e-85aa9909bfc6/simplicity_snow_blower_parts_manual.pdfIn PDF document text
    • http://xetoluwe.epizy.com/agency_fb_black_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11781027-6ab0-40b5-bad5-7ed0ad276d39/what_do_painful_bloodshot_eyes_mean.pdfIn PDF document text
    • http://birenogidovolus.rf.gd/37558696969.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_b2260d90038d4f148fd1773c46696b01.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_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 5192 bytes
SHA-256: cf42c3451e61c1d7347f96a7a6e0e608658513f028b932f793f6ccaa0938dee0
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 11260 bytes
SHA-256: 0db8649299270f3634e180bfc8bfb8d38301f8cce8dab9637808f4518afe8e60

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