Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb7f901a7968725…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 09:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 636d859ae45336d4dd12b5528de6c52c SHA-1: 236f50a7dee4e89141608ff7b7e76d06271ba9b5 SHA-256: 0bb7f901a796872505c027cf2315382b999f7111ad17192dd0be8fe4ba2ec187
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL, 'https://nipisod.ru/123?utm_term=c%25E1%25BA%25ADp+nh%25E1%25BA%25ADt+android+9+cho+htc+u11', suggests a lure related to Android updates, aiming to trick users into visiting a potentially harmful site. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

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://nipisod.ru/123?utm_term=c%25E1%25BA%25ADp+nh%25E1%25BA%25ADt+android+9+cho+htc+u11
    • https://static.s123-cdn-static.com/uploads/4471092/normal_6006e22f527be.pdf
    • http://serovakarara.mygamesonline.org/the_cask_of_amontillado_with_line_numbers.pdf
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fed9ce791ef5.pdf
    • https://cdn-cms.f-static.net/uploads/4376850/normal_6058f3195b6e7.pdf
    • http://dokakepitizix.medianewsonline.com/rig_veda_malayalam_translation_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4490129/normal_60419ef63ca17.pdf
    • https://static.s123-cdn-static.com/uploads/4390051/normal_5fe30c2eb64bd.pdf
    • https://static.s123-cdn-static.com/uploads/4382617/normal_60051925061d5.pdf
    • https://cdn-cms.f-static.net/uploads/4416506/normal_602cfe81b9407.pdf
    • https://cdn-cms.f-static.net/uploads/4405930/normal_605d6aa532685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_b4797c16662f4c50b175084a60a4a175.pdf?index=true
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_9c9c5b057ba74af3bfa6214582b42477.pdf?index=true
    • http://tijepexaran.epizy.com/33670561579.pdf
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_4f2bb1ec09454801a54c3c8f4e27b264.pdf?index=true
    • http://tukakuze.epizy.com/deflection_of_beams_experiment_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d386.bin
6851e4f1c94d126194121aacbac622e53b68ebdaf4841dd20dd036b9d41b96c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 5204 bytes
font_01_sfnt_off0000e4a2.bin
905556208050bb4e8ef6eed9b80bcfb94ad5b7dc397dd96758c2c37ed9f40883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 20740 bytes
font_02_sfnt_off00011301.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 4324 bytes

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