Malicious PDF — malware analysis report

Static analysis result for SHA-256 376a1709887b0148…

MALICIOUS

PDF

69.9 KB Created: 2021-02-18 21:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c05cdae5b5989238438e61d6dd93a19 SHA-1: 8edf39f8d247d843edeaf6bb05489abda311d948 SHA-256: 376a1709887b0148ff63abaf9daa67a3ccfeb164036dd1b5f2587ef16b4eea5d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'regents answers', likely a pretext to drive users to malicious sites. The presence of embedded URLs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

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://jottigo.ru/wix?keyword=june+2014+regents+answers+earth+science PDF link annotation
    • http://teaapple.space/vajozude2spy.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/578845.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/jD6uhjz/zombie_outbreak_simulator_mod_apk_android_1.pdfIn PDF document text
    • http://amaryllis.space/xigokibiforizka1bl.pdfIn PDF document text
    • http://flipping-car.online/tajawijizewironizx7iz.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/724d7.pdfIn PDF document text
    • http://carbackseat.site/dagukajuvibimuwifisilo5ed7b.pdfIn PDF document text
    • http://vk-settings-change.online/eddie_the_fox_25_bostoni1uvq.pdfIn PDF document text
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/5288126.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/1213249.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/2650975.pdfIn PDF document text
    • http://trokot-shopnew.online/103692131465nkkv.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/lukepepe/71326997833.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/database_technical_documentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/taruja.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_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 5524 bytes
SHA-256: 38cbbb73c40a981ae005becc719d7d59e65efd5fd707865e5513b77785db0b3e
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 14500 bytes
SHA-256: 11e58f362cdffcd8332dfb3062f6fe654eb398641b8ba313b49860f465f4b428

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