Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a703c664f23e1dc…

MALICIOUS

PDF

77.8 KB Created: 2020-12-24 23:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b9f5ad56664104466c9df7760a001e6a SHA-1: 9668ba252f5881360763fe33d716d4560313ba9d SHA-256: 7a703c664f23e1dcc0c8841300f649b83737ad700c9cbb08efb9cbcbbc49891e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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 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=cisco+chapter+6+exam+answers+2016 PDF link annotation
    • https://cdn.sqhk.co/xakawituk/Gheewjg/74572254042.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/94447a92ddd4f.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/5653262.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/e14a0e2.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/jhjeqzf/jewad.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/gieiiie/twice_kpop_songs_offline_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/m1hbWhj/64978079256.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/sorogamat/merizaxugoduvatikuperomaw.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/booklet_design_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/84446867186.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/77190229423.pdfIn PDF document text
    • https://s3.amazonaws.com/jolufozo/dmv_jersey_city_phone_number.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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 5688 bytes
SHA-256: 611cba4fbe67551ffd018aa519f35849dba16126c903c486196dea615b1fa879
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11032 bytes
SHA-256: a4b77206aab0a42ad3c8302cbdd8d61d35506238246a7c3910f3bd14c1a30097

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