Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d93f9e0b6f852bd…

MALICIOUS

PDF

96.3 KB Created: 2021-03-05 07:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0a68013e679140606ad70a082ce8e11e SHA-1: 71ec158a5bf2df57ed20a0f1360fba87d36c3019 SHA-256: 3d93f9e0b6f852bd7b946632acc2acc38f5294921060418a23dc0ade338c1754
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable domains and link farms, 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 techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=dr+seuss+clip+art+frames PDF link annotation
    • https://cdn.sqhk.co/xoberuweri/ghdighj/what_are_some_clue_words_for_description.pdfIn PDF document text
    • http://job-finder.space/insider_guides_inc64j6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_602ed0fe2e0a1.pdfIn PDF document text
    • http://canonsburglake.org/iron_jawed_angels_movie_answer_key67235.pdfIn PDF document text
    • http://ijmalan.xyz/4_pics_1_word_answers_picture_frameswq7bo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5ff6732532ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5fd107c4d0505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_600c3698c44dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd392a357846.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/iiffgcc/65171759994.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/crijAha/fazokobelipodireve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_60364ef79d7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_602780f6d6fb4.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/lomuper/27168702028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a934636-585b-4f64-aea6-1ec30110b8bf/fractions_practice_puzzles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daef6281-c546-4ea7-9c3a-c89b14b09bc4/5844445559.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/invitation_to_consultation_meeting_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 5160 bytes
SHA-256: 19e2fcd1fba1c7142f803cc1e9fe9121b014f76aaebb3dec08c53d6a857dcd57
font_01_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 11344 bytes
SHA-256: e4cd80712f51d6102b0a3096b7d2d62265a48438db9699201da97f79ea83c2c7
font_02_sfnt_off00015de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE7 16480 bytes
SHA-256: 16e8eb23c49baf523b69837ad0174cebde96bce324c6e71e011ec42af2eba895

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