Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eb1709ff1064cd…

MALICIOUS

PDF

88.2 KB Created: 2021-03-17 14:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8671497edc47fc7821eec5a099540d99 SHA-1: 0ab4bb077a426a76da308cb1fa68c765e9e89730 SHA-256: a9eb1709ff1064cd2bce10f18c683b075e816734bc7fe8f606ce500440a3fdae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://maypoin.ru/wix?keyword=link+budget+satellite', likely lead to phishing or further malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it exploits PDF vulnerabilities to redirect the user.

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://maypoin.ru/wix?keyword=link+budget+satellite PDF link annotation
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/novuvi-pepagesesam.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/75308102865.pdfIn PDF document text
    • http://pojokup.getenjoyment.net/quality_management_specialist_healthcare_job_description.pdfIn PDF document text
    • https://rusufonexu.weebly.com/uploads/1/3/4/4/134481083/rituva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_601fffb2bd191.pdfIn PDF document text
    • http://mufedizoz.22web.org/lg_g29_direksiyon_seti_n11.pdfIn PDF document text
    • http://rigipufefe.iblogger.org/present_perfect_tense_exercises_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6044f585f1ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_60129e496a9c4.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/which_is_better_kitchenaid_or_kenwood.pdfIn PDF document text
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/5785740.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/neviwove/comprehension_worksheets_grade_12.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/cavalier_c51_coke_machine_parts.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/aceite_de_palma_en_colombia.pdfIn PDF document text
    • http://guvamimifufirar.rf.gd/children_s_formal_dress_patterns.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/86086524500.pdfIn PDF document text
    • http://fabomisibis.rf.gd/which_is_better_roomba_960_or_980.pdfIn PDF document text
    • http://karatufi.epizy.com/copperplate_alphabet_practice_sheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 5040 bytes
SHA-256: c2f29d6f3807dc175089a8ae5534388d79ec3f7831b6ae644487700ee9449265
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 12792 bytes
SHA-256: 1343f8fd0d7c5f8c48396ded6c7f7e33f2a0c4235425d4d7fb849a410851589b
font_02_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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