Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ba572ff3416eb0…

MALICIOUS

PDF

73.3 KB Created: 2021-05-11 02:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ade4efbbd34890f9cf139e885400fe78 SHA-1: 222290837f230e3dc7fc2cec804c3766ef1b76d6 SHA-256: 69ba572ff3416eb0cbdc1661a235551d694436082e5c3ba566aee74f88d4be31
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 domains and exhibiting link farm characteristics, strongly suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to lead 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://mezovuduw.ru/strik?utm_term=phalogenics+method+exercises PDF link annotation
    • http://idealica-ordina.site/free_online_movies_2020_apk_downloadujzs1.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/cassida_5520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_600460cab364c.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/2Kf419z/ludo_game_download.pdfIn PDF document text
    • http://fastnoutservice.ru/vista-21ip_quick_user_guide9c6xv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5feb155d2db9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6005f4c7e15f2.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/89740093111.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/jSCijgc/30881317018.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/bookkeeping_tutorial.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/zafijukopa/nuxiwigemolegiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b53c048-ab55-4aa9-8adc-1eca82dd48a8/sharepoint_framework_tutorial_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/angles_in_a_triangle_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f31b4b0-9bab-4640-ab1f-16998d3ab3ca/fafarogaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcff9c70-1244-4c8c-b0cd-c736650148c4/the_killing_joke_movie_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/the_three_estates_definition_us_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfb3a16-75b4-4850-9743-1575ac3a32a3/91862134476.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5424 bytes
SHA-256: bfb28ea9c1fab53eb30a5b9792801d4a9719fc5f034844c657fee12d51b9e732
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 11732 bytes
SHA-256: 057031faa317cd2d7e2b22884f96d01d5f74946da820620905c4b51e857e97f9

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