Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa558c1f97480fbc…

MALICIOUS

PDF

104.5 KB Created: 2021-04-19 11:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 076ecd27e3e70dbb562ad1f99e1befd3 SHA-1: ef7a7fae66c7e6c5aa53859a0b5caacfcd6f61fe SHA-256: aa558c1f97480fbc5cce31f86de8d9f3a89f0e871f11d8a76828dc9c57dc4cc9
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'community development' and 'wkhtmltopdf', which appears to be a lure to disguise the malicious nature of the links.

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://ponafet.ru/strik?utm_term=what+do+you+understand+by+the+model+of+community+development PDF link annotation
    • http://ginixotojaru.medianewsonline.com/7682091476.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/faxoli.pdfIn PDF document text
    • https://xukunuwemixul.weebly.com/uploads/1/3/1/3/131384589/3582751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_605d70b8dc711.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/rusosigeza_wuzodonoral_xotazosum_zekulijo.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/73862055260.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/bautagebuch_beispiel.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/24281358879.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/tozovule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6033ae891e2dd.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/bulofaluz-beduzonujamazot-rexosajidanen-menidegam.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/7408384.pdfIn PDF document text
    • http://wixuzod.iblogger.org/kipigusuz.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/todasud.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/ladili_dejawoguroleje_fanuvewojakipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xerizovikaletu.rf.gd/nugujetad.pdfIn PDF document text
    • http://pimubejat.epizy.com/53321593720.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/abceso_perianal.pdfIn PDF document text
    • http://xafupovavosife.rf.gd/ditimiwamatopusek.pdfIn PDF document text
    • http://vulafaxenoza.epizy.com/cambridge_english_proficiency_test_with_answers.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_off00015a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A78 5708 bytes
SHA-256: 11b32f164abb0c61f98424faa8647dc4c92890dafc545dbccc290a5b29388b3e
font_01_sfnt_off00016dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD1 11836 bytes
SHA-256: f05fa847fea1b6683b05fd39865a207f950390c485d88a1d7845692516cc64ab

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