Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c838903dd0f66…

MALICIOUS

PDF

88.6 KB Created: 2020-12-11 21:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 923f38573e99eb08eb4b0368bb4c9597 SHA-1: 1880bd3e0fc8e04758d7ac52c2a8492dce688d4c SHA-256: 1a0c838903dd0f661a0afe579ceada3743776850d4d08f4307e32d944cc5ab12
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, along with numerous external URLs pointing to PDF files, suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure itself can embed JavaScript, which is often used for malicious redirection or exploitation.

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://traffset.ru/strik?utm_term=sycamore+tree+flipped+symbol PDF link annotation
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/692735.pdfIn PDF document text
    • https://pisebozelo.weebly.com/uploads/1/3/4/6/134657423/645966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f8d42d27738a.pdfIn PDF document text
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/506779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_5fa42c2b68e6d.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/3924324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wonoti/mixed_modal_verbs_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60391a11-7d6f-4acd-8b1d-4fef9034a543/55624701034.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/formica_laminate_sheet_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/mewudujafuzanu.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/video_editor_for_android_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/commando_2_movie_hd_1080p_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/fizevipotibefowikasapa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 13960 bytes
SHA-256: 6902f7032a5613c3c4305119cc1ee0e9c5c1db6587f2cf53d20a86ba84b1aea2
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 5328 bytes
SHA-256: 60c2340acfeab1122d2d04f1f63eaa87f8b05b4c3fa725aca54ac57a936a8237
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 11340 bytes
SHA-256: e7730f8bf7f6ccc1e1539d9c6d98bff7187c907ba88806234f7feaf290759158
font_03_sfnt_off000145c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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