Malicious PDF — malware analysis report

Static analysis result for SHA-256 511205300b557672…

MALICIOUS

PDF

80.2 KB Created: 2021-05-28 08:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f7aa09f5f62d14be4873bc3d4b22b7c SHA-1: 598e09e54881ebd025491b44305cb900f79c9007 SHA-256: 511205300b557672a1412ca01ac4743253e384758b0cc5d613264bca9bb582cb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming tactic. The primary URL, 'https://dafemum.ru/123?utm_term=online+pdf+translator+arabic+to+english', suggests a lure for users seeking translation services. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

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://dafemum.ru/123?utm_term=online+pdf+translator+arabic+to+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471235/normal_6021902857926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_6059dc2d393ef.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/fekukolomuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_60104ca068b8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fe08dcd18a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fe9788188eff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5ffa9e5e23fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_600bf9a029adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_605432f2470e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_60299098b7e92.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/d231f906f4fc02f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fdee50c02c0f.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://uploads.strikinglycdn.com/files/54e54215-c18f-46ce-b7c7-264f75cdf622/16481524649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abec08c-7b8e-42d7-aedf-f57827f12fec/pisomovajof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2132ef-d222-4e35-b84c-f8e369880f61/42802057521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4c6842-8fed-49ea-9b10-ba7e1be04853/wordly_wise_3000_book_12_answer_key_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f1e9da-2e09-4590-a8da-3e6b5953ee40/wogewaresijed.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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 5372 bytes
SHA-256: 10cc2e2d228673cea5d7668c79297a628f70bd24986ef81ed4110f80742e636c
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10376 bytes
SHA-256: a9b20d3ce11c32557bfd50b45f3d6fc5995862d4da5e514daf6eae39b0527669
font_02_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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