Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23ae6847b649025…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 08:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ebb3153b4af3b366b2468447c7ebb589 SHA-1: 9dee840424d9fdeb010341dec5916cf50bf9411c SHA-256: a23ae6847b649025772d16cdaad40bf9e36a0204fb145c70cd3631006e51e9a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically crafted to mimic a search result for a product. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://druttle.ru/wix?keyword=instant+pot+ip+duo+no+manual+button PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417139/normal_602cac9a966ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_601ad31b1d7f6.pdfIn PDF document text
    • http://vedice.ru/vaseraxosigelebuliekey.pdfIn PDF document text
    • http://twirlini.com/que_es_educacion_fisica_en_movimientojdj5h.pdfIn PDF document text
    • http://hq-cleartv.info/american_pie_book_of_love_the_biblek8phg.pdfIn PDF document text
    • http://astrohelp.space/betitowimobozgkt73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_600fa8423bec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5ff65bc5e00f0.pdfIn PDF document text
    • http://myfavoritesun.xyz/44714117141t2bfl.pdfIn PDF document text
    • http://homiak.fun/xepizudomewarapexukalemqhzw7.pdfIn PDF document text
    • http://introdom.ru/bogixedisn0wfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_600dfd8581107.pdfIn PDF document text
    • http://vuxiparami.22web.org/kokugariwabet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_600de0785ae96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5ff70851f0f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_602ec887b3d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fd3cd7150feb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumavoralamo.rf.gd/properties_of_exponents_practice_worksheet.pdfIn PDF document text
    • http://vevenamefod.epizy.com/bar_cutter_manual.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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 5084 bytes
SHA-256: 344541eae095adb81fabd76773531decf2d56eed8b4c4076c04085e7b67d78bf
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 10156 bytes
SHA-256: aa38f5275d17b113c6170073492782bd8ddca09a764ae2dbff8b6f1a7b9b676e

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