Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51dde862e9b3b15…

MALICIOUS

PDF

71.7 KB Created: 2021-02-13 10:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 47f2a7e6d8e33cff70ff8a83b6f4f075 SHA-1: a45ec6a0d9637887b19de8466de008d06a71df74 SHA-256: a51dde862e9b3b159b1f9a799170c8eb2867d4b7f3ce5a34044ac0cb9907a2d5
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://druttle.ru/wix?keyword=how+to+activate+apk+file+on+android PDF link annotation
    • http://lolkek.xyz/comprension_lectora_4_primaria_santillanagz0rd.pdfIn PDF document text
    • https://falitevegenos.weebly.com/uploads/1/3/4/3/134321562/c0d4ed.pdfIn PDF document text
    • http://souve.me/4701852985t7a4z.pdfIn PDF document text
    • http://front-glass.space/residence_inn_north_conway79idc.pdfIn PDF document text
    • http://nibumuxadata.66ghz.com/vibigonadufatotesodunapaw.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/51948cb4.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/b958327fb.pdfIn PDF document text
    • http://esclick.pro/zaterolarawonivozovajilasfzija.pdfIn PDF document text
    • http://hookup666.site/871254944608nfcc.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/174ec20ccd.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/2477742.pdfIn PDF document text
    • https://jatakusikafe.weebly.com/uploads/1/3/0/7/130776866/dufulanagaropi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawarawoxegig.epizy.com/mappa_agrigento.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 5148 bytes
SHA-256: dbef4ad8134e7d2187fd9921dd66a5a4bfddb110857f3d433935900b422ccd5d
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 10196 bytes
SHA-256: 999d81ed9003e59b905229824790c6764019aa9b191613afb0a09eb988a55722