Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d175394c56d0e46…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 19:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 719e5f00c31f61c1150b12527f25070f SHA-1: 526f02a37c08e9ce96545b36c199efbcf1d4593c SHA-256: 8d175394c56d0e4651d1f90fbe99a7ebbd05243f7a5c5704067715e96c00833b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The document body, though heavily obfuscated, contains references to 'Brain bee 2019 study guide' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature of the PDF.

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://leonvi.ru/wix?keyword=brain+bee+2019+study+guide PDF link annotation
    • http://lovepositions.info/the_surrender_experiment_book_quoteshm72j.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/putelalikuse.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/kafuvomuwomegemikuxebi.pdfIn PDF document text
    • http://hotita.fun/188685762996l9yf.pdfIn PDF document text
    • http://munivujikax.22web.org/15445764833.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/223ba3a5f.pdfIn PDF document text
    • http://fortuneo-enligne.com/ergonomic_articulating_keyboard_tray_with_mouse_platformv7wqv.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/how_to_write_a_synthesis_essay_step_by_step.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowilewegiwo.myartsonline.com/34379394758.pdfIn PDF document text
    • http://lijabefenuzif.rf.gd/mopifunife.pdfIn PDF document text
    • http://girofili.myartsonline.com/62422902433.pdfIn PDF document text
    • http://nejuzuwesikodik.rf.gd/43470597002.pdfIn PDF document text
    • http://fopaguduvogo.rf.gd/que_son_las_enterobacterias.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/traditional_tattoo_books.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5732 bytes
SHA-256: dcbbdf9c3c1244643926625873d3542658a7b9d9a61082a7ebd8c6e7e7881924
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10328 bytes
SHA-256: d68c2bdeb6d94833c2cdbdfb69a6c30688a0dc44b1dee7d51bb4c1422e25f0a5

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