Malicious PDF — malware analysis report

Static analysis result for SHA-256 487de5499e9b4e96…

MALICIOUS

PDF

82.2 KB Created: 2021-02-16 00:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb6c1fd497c1a2f4dd9edf917019c2b1 SHA-1: 7dc68ebd63a627795f495aba9fcf742fb4e63706 SHA-256: 487de5499e9b4e96217f3f11f895c84b30a63ba45a78fca5f07f2fb6204ce729
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL leading to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to a product review, suggesting a lure to entice users to click the malicious link.

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://druttle.ru/123?utm_term=braun+7+790cc+review PDF link annotation
    • http://atlas-copco.su/gexite65bc6.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/citroen_c3_aircross_manual_usuario.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/gi9EJhc/38198624433.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/FLVhixG/nijofunedavojoba.pdfIn PDF document text
    • http://carluxepaint.site/rutevejivabobivazawijactogr.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/9570883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fce175c6199e.pdfIn PDF document text
    • https://widedajixefur.weebly.com/uploads/1/3/5/3/135312737/9860531.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/turaxel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_5ff5263e66d55.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/limovo_buwoludosele.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/hdTIF9B/kolapen.pdfIn PDF document text
    • http://adr-media.work/electrical_meter_box_lide4bsq.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/vibasujefir/interactive_website_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/making_healthy_food_choices_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/aptamil_active_informao_nutricional.pdfIn PDF document text
    • http://pejefovad.epizy.com/transformar_de_binario_a_decimal_online.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/lcvp_summary_report_visit_in_sample.pdfIn PDF document text
    • http://kagilabitivibe.epizy.com/991963544.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_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 5164 bytes
SHA-256: 18ff6e6fe499d7d4cdeb32f55b5ef2f3421f5541fe7a769cf19552a44c19197f
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 11652 bytes
SHA-256: 036211b8707aa2a5a8de38146354a4d343db789538224f8f63c76d8b2a08e83e

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