Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d44d4c27c2404…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 01:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8d334954dc2b99616abc59be7f8b9934 SHA-1: 9473bb57a50549c7024a2ef96a9ed1b796a8b623 SHA-256: a66d44d4c27c2404fef8d52a1905809babc45e7367b7206371fd0cfa06d7fc24
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=yeh+shen+book PDF link annotation
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/rizerokanidaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/jbhbghD/korulon.pdfIn PDF document text
    • https://ponivigaxuk.weebly.com/uploads/1/3/5/3/135313456/mepegepefosu-zagolef-zexefe-rilofozufedu.pdfIn PDF document text
    • http://circleshtang.xyz/dimensional_analysis_practice_worksheet_with_answersqe1qp.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/57554813918.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/wavorepubelaviwib.pdfIn PDF document text
    • http://erogan24.website/diselafapeky2re.pdfIn PDF document text
    • https://modisogisutoval.weebly.com/uploads/1/3/5/3/135390942/zanuw.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/diaaAPZ/apply_australian_defence_force.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/square_d_well_pressure_switch_wiring_diagram.pdfIn PDF document text
    • http://ionatr.fun/dozojafevogamalx6zfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5ff0c53196232.pdfIn PDF document text
    • http://dompodklyuch.com/surah_yasin_sharifdhne1.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/gapivegek/vidmate_apk_lama_apkpure.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/the_power_of_positive_thinking_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/nfl_schedule_2015_playoffs.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/cloud_atlas_book_reincarnation_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/27916962245.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 3948 bytes
SHA-256: 098c4e44a79d48df1552db22973f6ade44afffaafceffd9818edb35b55211103
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 4600 bytes
SHA-256: 9c2d341cac5abb53df869534d13c8ebb9f846dfbf48d17d7917537deb12e1901
font_02_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10820 bytes
SHA-256: a7a26707478a24ae265e808eb2d35a0fbb40a057bcd9c5d00e1141aae29d884a

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