Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6971cac10e1d4e7…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 04:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 89c2c5b1aeea237ed8e83f1d669db002 SHA-1: 1c0442b051a788b0efacc4584994edef48e1be3b SHA-256: a6971cac10e1d4e793b1f490c83e7062bd1276a6c0797c8e36c98601f6d65a69
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to potentially malicious websites, such as the one at 'baarspo.ru'. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript for malicious actions, such as redirecting users or downloading further payloads.

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 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://baarspo.ru/wix?keyword=graphing+distance+vs+time+carson+dellosa+answer+key PDF link annotation
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/2948471.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/tozafur.pdfIn PDF document text
    • http://nositadox.mypressonline.com/html_link_to_open.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/2c39fa34.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/nilafafakem/rimworld_steam_workshop_er.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_ce9915c35366453f8db4d778e13c59b1.pdf?index=trueIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/92444193743.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_9d96f40401404c19b8fababd42dda4b5.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_ba614b3a599a4912a0c5eba4d94ae839.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/62940598623.pdfIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_e6d5c030d930496792e25424e917dd47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/chocolate_tamil_full_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/3300725399.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/pomejalurezem.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/lillington_primary_school_ofsted_report.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_e99873d681e04232baaa2fc62c8bf724.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/buneximav.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_7fd0f0a96de746a6b48f24e90a2a230c.pdf?index=trueIn 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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 5624 bytes
SHA-256: 650542d0ecbd47ec9163dcbb4f332be3c773f1d1c8d92cc3a87c859902339414
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 10572 bytes
SHA-256: 66b631a082224cb5522813e298b4b1ef8a63e3d6aa218f27edf3a5d7b3954f6a
font_02_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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