Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c2f033a4da9398…

MALICIOUS

PDF

74.7 KB Created: 2021-01-03 04:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb7632e6849096d3aba82ec9261a9d0d SHA-1: 7ef33dd9ba67a33a4157fa9811ee578a6674e33e SHA-256: c8c2f033a4da9398c3a1684022989313740e988a060417e0154ac86322c01a7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a distribution mechanism for other malicious content. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links indicate a likely attempt to redirect users to malicious sites or download further payloads, potentially involving JavaScript execution within the PDF.

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://traffset.ru/aws?utm_term=tunnel+cavity+preparation+pdf PDF link annotation
    • https://cdn.sqhk.co/sopiloroda/HnifDgc/dedidilenizivixanot.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/Jrgclgj/two_dots_travelers_trail_remix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_5faab4b5d8c01.pdfIn PDF document text
    • https://ribimefisele.weebly.com/uploads/1/3/4/5/134516567/5691577.pdfIn PDF document text
    • https://lemidedimiba.weebly.com/uploads/1/3/0/8/130874299/883845.pdfIn PDF document text
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/bcb9cb930458a.pdfIn PDF document text
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/redibezupajewadoduw.pdfIn PDF document text
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/2341644.pdfIn PDF document text
    • https://gosazakinuda.weebly.com/uploads/1/3/4/8/134861856/wifusopexumef_xopetejimutej_fepabalutuputan.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/pazifetanegapu/aula_de_innovacin_educativa.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/jiginekuza.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/zewijavitigasaxixabur.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/flexform_cestone_prezzo.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/seresulevikubavibifarobu.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/download_roblox_apk_file.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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5080 bytes
SHA-256: 448f623827029ddffc5d5c02122e60662182b594990239a0ee0a515ba0aa8628
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 11172 bytes
SHA-256: 5dd7706fcee4c86c3db473f594add407fd84537769e4a79a7982b457bd7c748b

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