Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcaa90f7679d010…

MALICIOUS

PDF

74.5 KB Created: 2021-01-19 18:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 88d1bf0b097c0b759a5c947ef98a77e6 SHA-1: 04c562d438284f4b33423f9c6ff12d41fa5a7da0 SHA-256: 5fcaa90f7679d01038e4667f71debd95be02c4067317239944882fc2b501032f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

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://trafftec.ru/123?utm_term=che+troi+nuoc+calories PDF link annotation
    • https://cdn.sqhk.co/fifapupifig/ZzhaHhO/minecraft_pe_lucky_block_mod_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/geF2ggX/banana_kong_blast_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ejagcqz/space_shuttle_columbia_disaster_risk_management.pdfIn PDF document text
    • http://xapakemulu.22web.org/36886902117.pdfIn PDF document text
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/mezerewegejef-zikoximebexixuz.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/46034374513.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/hicpjh3/guided_meditation_for_kids_script.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugekalamiwatek.epizy.com/valuvufelarid.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/pirates_of_the_caribbean_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/88207380808.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/43250765652.pdfIn PDF document text
    • http://zibinafo.rf.gd/whatsapp_free_latest_version_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ponopewulebutamudid.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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 4792 bytes
SHA-256: 36661be4d495193580515d6eb5c8da1717ef232d686a825a041eb204a3400f62
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 11904 bytes
SHA-256: 5be0f110ef9b1586adfa6ee43d469302ccc1e27182451805256dc9d59edd49f2

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