Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6026319d276def0…

MALICIOUS

PDF

69.0 KB Created: 2020-12-18 01:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f05f8667ad77fff00e1b4d44df113d53 SHA-1: d2ee51728e92ada2a6d90e246a68fac21a73d8ff SHA-256: f6026319d276def026f48d66f167017f4a6372b898f6a73c9fb1d6dc65d5ad82
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially malicious websites. The document body, though heavily obfuscated, appears to be a lure related to 'informal email writing'. No scripts were extracted, but the presence of numerous external links points to a malicious intent to redirect users.

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://trafficel.ru/aws?utm_term=informal+email+writing PDF link annotation
    • https://xinulirolome.weebly.com/uploads/1/3/4/5/134599248/940133.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/7349712.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/8999598.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/7797364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fd787800b7da.pdfIn PDF document text
    • https://reredutubonuki.weebly.com/uploads/1/3/0/7/130775370/lisakefixul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f95370642354.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/96859eee-457b-49a8-9231-4bbee6188a1e/rogovod.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/weather_report_koh_samui_thailand.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/kerbal_space_program_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c6b235-696e-4686-85c0-00dda55509c4/leccin_4_estructura_4.1_conversacin.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/zuwexidixonolaxuxurotusos.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/unicellular_and_multicellular_worksheet.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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 4936 bytes
SHA-256: cb23d8810fb1b258548577a7b204896b77ef92d7f81f498077424cbfeea75505
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 10544 bytes
SHA-256: 5582f389f5bf9817ef31ffe85d650ffec83a76d60b66b23f24adb1807a2ddbc6

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