Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ba854ae8a232e9…

MALICIOUS

PDF

91.1 KB Created: 2021-04-08 03:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 908a0367d091f0f8aece14398ebcfb59 SHA-1: 05bb9fdeef1464b04d5a98737b1f7d4f2e86e89a SHA-256: 73ba854ae8a232e9fbe88b2d9c5f62871adf669051dcf8ef4c061cb67b4ac63a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites like 'dugedepap.ru'.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=how+to+fix+a+jammed+sew+cool+machine PDF link annotation
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/nopinewuwesaje.pdfIn PDF document text
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/b9f84d8036a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_6039500e8da6d.pdfIn PDF document text
    • http://mastericy-chistoty.ru/video_editor_windows_10_freet429f.pdfIn PDF document text
    • http://twirlini.com/82571534937xgm0y.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/8030721.pdfIn PDF document text
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/jixedu_kexewatizavot.pdfIn PDF document text
    • http://remontlegko.info/punuvotaramale5byfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_60653f3dc7ac2.pdfIn PDF document text
    • https://kowupozot.weebly.com/uploads/1/3/4/8/134887449/waluvigemuzupuwad.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/rokuwapesu/12419745015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34f1e9a-0a3c-47a5-a052-b4f00b1019de/how_to_train_your_dragon_voice_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/12283961661.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/dap-1650_wifi_range_extender.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/vovoposamimagedidefisoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4578b968-ede2-4870-ae33-ad851d8e243d/ozone_500_bike_rs3000.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/75346078638.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/industrial_training_report_conclusion_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/nanewufeluxutiwefirixa.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/consignment_note_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b33a4cc-244f-4537-8ab4-49cb5ee87a68/how_to_download_google_cardboard_app.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/reflect_and_relate_3rd_edition_download.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_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 5360 bytes
SHA-256: 446d9140b26724872919cce6413e0b96e82b5a39845369b51e0d43f877a5cdcc
font_01_sfnt_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 11132 bytes
SHA-256: 0f115171d8d3643be2039ac845026f6a2c659d14c09da5b5096cdeb6b5b64175

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