Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1c3a9436e1cf4c…

MALICIOUS

PDF

75.4 KB Created: 2021-01-27 06:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9da3180a789640463ac359724cde562b SHA-1: 059d6910440056865458bb5fd1d0e3f978d6f9fa SHA-256: 8d1c3a9436e1cf4cd587876b5a921edb1631cd8c35b1ed8c0a394fa0296bdbe6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://baarspo.ru/aws?utm_term=colorectal+cancer+follow+up+guidelines+australia', is directly associated with the PDF's content, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 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://baarspo.ru/aws?utm_term=colorectal+cancer+follow+up+guidelines+australia PDF link annotation
    • https://cdn.sqhk.co/jekurona/fJgijju/22056930721.pdfIn PDF document text
    • http://juzajikadig.22web.org/banjara_geet_dj.pdfIn PDF document text
    • http://movigakamemik.22web.org/28361580286.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/ba072dc07bd9.pdfIn PDF document text
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/vemewino_wepilego_kaxulavuxovenu_pirevobawoto.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/paxivogedewilu/87379147044.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/que_es_un_uniforme_de_enfermera.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/dungeon_of_the_endless_reddit_guide.pdfIn PDF document text
    • http://kesotufujurox.rf.gd/1165508846.pdfIn PDF document text
    • http://kefixofelapadi.epizy.com/bajaj_auto_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/29_card_java_games.pdfIn PDF document text
    • http://lowadof.epizy.com/cours_sur_le_bulletin_de_salaire.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/70347403203.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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 5320 bytes
SHA-256: 78762b115ed3a15a7c4a20a8fa69d9f0f50142aa472dc50c095575763899ad84
font_01_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 9980 bytes
SHA-256: 8ec8e7c2c3dc739e24bfbc7373b1407e19cbaf313179e2070d0efecf1ab4061a

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