Malicious PDF — malware analysis report

Static analysis result for SHA-256 a083e12da98de7c4…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 00:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca5e2e445efbfb3af9ec7ca1232c4690 SHA-1: 0f1a2d8588ca0b2fd69cf860880c12b7a3c8b377 SHA-256: a083e12da98de7c473a120b73e6f15fd178bd90b208caccdd13372673877bcfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://vilenefex.ru/aws?utm_term=why+is+my+dell+inspiron+not+charging PDF link annotation
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/tajumuvowuxojifot.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/is_134a_compatible_with_404a.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/zatasedewijutebi.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/vagepamuw.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/a2987ac4d5f.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/74c769245.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/zovenik-terumaponimot.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/vepev-gigoj-zixasugadezefex-gudabadoj.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/do_you_capitalize_professor_emerita.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/1438757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_138341651c584ea5879b18a45bb570ed.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_1b9965a9d4944c889d1e7ade9355251d.pdf?index=trueIn PDF document text
    • http://lepetape.epizy.com/bhairava_dweepam_naa_songs.pdfIn PDF document text
    • http://nowaginog.epizy.com/zuxado.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/php_mysql_para_dummies_espaol.pdfIn PDF document text
    • http://lukegijabezul.rf.gd/english_encyclopedia_dictionary.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_05f5c7f6457744fd8f006053eb797f4a.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_3060381909a54e2189eefeb6a52bb2af.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 5600 bytes
SHA-256: 5dcca605b13df5d7784deda3f210674fa05dc3eced352dc516c24ab5f705ed79
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11084 bytes
SHA-256: dfb4804e86a7316bbd95841051e0724b332beac2d3b43b9a8b5b02b1c9856438

Open this report in the interactive analyzer, or submit your own file for analysis.