Malicious PDF — malware analysis report

Static analysis result for SHA-256 13432827c55cc49f…

MALICIOUS

PDF

83.7 KB Created: 2020-11-25 12:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7cb91f02ddac5903d1cdb06e15958897 SHA-1: b5d874a34af832478139c6483758215e6a6bdea6 SHA-256: 13432827c55cc49fde75a4f1ceb23caf57442a1476b7be357b59cf1e33fc7987
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being a link to 'https://uploads.strikinglycdn.com/files/e6d78f3c-cf39-425c-9db9-961450ba2128/damavesolemezekajulalima.pdf'. Another external URI, 'https://trafficel.ru/aws?utm_term=android+animatorset+loop', was also extracted, suggesting the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/aws?utm_term=android+animatorset+loop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5f9efebe85213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_5fad11f678eb1.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/sizidujutipusilel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_5fb36bb911f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5fb840ebb1efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fba7e3454817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d78f3c-cf39-425c-9db9-961450ba2128/damavesolemezekajulalima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f77ebc-c3c4-427f-9bcd-a1731fdff9d4/tuboveginanekuki.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/zisobekujuroxotobimuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92377399-1675-496e-b527-234b9b7a6777/pixobilaburokoxezazirapo.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_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 5092 bytes
SHA-256: ed7a1747c60055fa8b8af65c1684d5de2b1ef6a5db6ceb5353ef1672402f80f2
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 12672 bytes
SHA-256: dfaeb4e500483920bd8b092109bf945365fc87b5478621ba688092523dd57ab0

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