Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffe7aa258808919…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 20:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 684689b3256f07cf2ccb25bb3008aec7 SHA-1: 7d6f919e580cad22a49397808a197d910e3b7021 SHA-256: cffe7aa25880891923b03cd9ebb70a92f33894497be5ac1b698ed9ce40110086
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing attack aiming to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=bioprocess+engineering+solution+manual+shuler PDF link annotation
    • http://samafutanub.mypressonline.com/chapter_13_to_kill_a_mockingbird.pdfIn PDF document text
    • http://norusezuluwo.iblogger.org/how_do_i_connect_my_wifi_extender_to_my_router_without_wps.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/60438629334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366017/normal_5ffb6d321e5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_6026a7b2392c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_603f28e504d42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393503/normal_60028e2a21307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/gapebe.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_5d16697423ef4a3d985f75d65d87965e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25dfb1b-25d8-4e15-9a84-eb3d13f37908/new_james_patterson_books_michael_bennett.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_a92c55b52b8d4ccb8ac07a531fd7d590.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/18314788635.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_90f21d62f9a84da98f9ff700fc361b4d.pdf?index=trueIn PDF document text
    • http://sekuwomexapa.myartsonline.com/dezivoxavuzuforu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32c4148-266e-4def-be55-250f15c1efa9/pogow.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/nutijefozonafe.pdfIn PDF document text
    • http://bobujosu.epizy.com/faforakuwerodidimaker.pdfIn PDF document text
    • http://kivevufawonin.rf.gd/aggiornare_android_tablet_mediacom_1010i.pdfIn PDF document text
    • http://kitabuzulex.epizy.com/24421473599.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_86fd567830d142ab9c6c89cc2b50838c.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_7dbc605dc02946fda3da8b492e1985a7.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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 5396 bytes
SHA-256: 752274a703ca293bef670c283cb294ec20186e6008afa77be296a0a8108da059
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 11428 bytes
SHA-256: 059ead6e75db98d28eef610165cd93eb295903f287d9e416fc0aad37a611a6a4

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