Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaaccf0c5da6c77…

MALICIOUS

PDF

77.6 KB Created: 2021-04-13 14:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fffddb0f525d44257ace941c063e8e26 SHA-1: 5ade8648c728811cd31b237be408cb201ebb1b86 SHA-256: 7aaaccf0c5da6c7797706f10e455b010f587cf039e58f764c9dcd770b781945c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one pointing to 'http://kosezofejesuxef.atwebpages.com/fatidewipuduf.pdf'. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=tampa+alissa+nutting+pdf+free+download PDF link annotation
    • http://wide-mean.top/22177125107fywzt.pdfIn PDF document text
    • http://smartcoin.design/tenu_aakhya_ka_yo_kajal_songxbn8x.pdfIn PDF document text
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/penizipakafiwe-wovuvulobikadu.pdfIn PDF document text
    • http://allieshouseofhope.com/skullcandy_indy_case_wont_chargez1ybd.pdfIn PDF document text
    • https://xubakoveg.weebly.com/uploads/1/3/5/9/135967212/b580cb4.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/integration_formulas_calculus.pdfIn PDF document text
    • http://usesucre.pro/inpa_error_ifh-0018vl701.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/56de7.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/business_case_study_template.pdfIn PDF document text
    • http://cethq.xyz/16054882664k8fet.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/les_cenci_artaud.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/pijemepeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/fatidewipuduf.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/council_who_decided_the_books_of_the_bible.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/fisiopatologia_cirrosis_hepatica.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/data_analysis_plus_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/maltese_falcon_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/workplace_safety_inspection_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/76097029829.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/75500721265.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/85798393474.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_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 5404 bytes
SHA-256: d8af4869ab2d8a43feb338ccac474db108f69e544c405e36bcf93d107e8c8e6d
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10556 bytes
SHA-256: 7c5652f3f9408a7aea939738557275552671a22dd32cf962c0d304dbd161d8cf

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