Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aebecf5b528685e…

MALICIOUS

PDF

83.4 KB Created: 2020-12-15 21:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e3e3c9eb7257737306337c61de63ac38 SHA-1: 1aacf5d88f8659f974521379483f5460c62f91fc SHA-256: 2aebecf5b528685eef4f2fb79418ec418cd98ad68c5a4dd7936fd04bbf94d530
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to manipulate search results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=nys+english+regents PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f9be9d53196b.pdfIn PDF document text
    • https://fejigurize.weebly.com/uploads/1/3/4/5/134509658/8818714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fc34d7dc7193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_5fc3be8e2776e.pdfIn PDF document text
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/nejaxonoxedavolofex.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5f9718019de52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f9ce63aa5029.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/bofiko_wuserawojavu.pdfIn PDF document text
    • https://xulalotuk.weebly.com/uploads/1/3/4/5/134593582/5002046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fc1ba4f01eab.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/d74b03478a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_5faab7371ceac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fa9259402bc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc5a3e840f1034a5cc929d3/t/5fd67bdab1c3f31c7a8528b6/1607891931275/nunegoxomasopalaserekaso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 4484 bytes
SHA-256: cc00df3183578a5ebb2cee10cbf8cf54015b134be5bb114e082c38c442c6d351
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 11576 bytes
SHA-256: 2efcb2acc1dbbadc69b924e5f6a039b6e6c016cba59ad3f4a98efebb35444040
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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