Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb386f6bbc5f2c45…

MALICIOUS

PDF

109.7 KB Created: 2020-12-06 04:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1459cdaa24a51e7c39340f971766b7f9 SHA-1: 9567cbe6281bad8a8c374f2c6e28199d5e1a903b SHA-256: fb386f6bbc5f2c45ff693c386465a08bfbd6c0a1babb33bf2bf7a82a4ea47768
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=aztecs+empire+timeline PDF link annotation
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/sarogufusurexejoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5fa63e788c7a7.pdfIn PDF document text
    • https://fipuvulozubonoj.weebly.com/uploads/1/3/4/3/134313175/rakufufireso.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/sikuva/oxford_dictionary_apk_data_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/endnote_cite_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/mejevuvebarepabivas.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/cure_81_natural_cures.pdfIn PDF document text
    • https://s3.amazonaws.com/faserubafa/maytag_bravos_dryer_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c18123-d237-425e-b3f5-b4934845fb4e/bibb_county_georgia_school_calendar_2018-19.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc380a327a199023ac5df36/t/5fcba7a46fd93023bc099d4e/1607182245152/49525720658.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/how_to_clean_fireplace_brick_with_baking_soda.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/acneiform_eruptions_images.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a3195e8e827d4299026a/t/5fc538d9bc819f1cf482963f/1606760669228/juwogifalowaposisegow.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_off0001640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640A 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off00016e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8B 4908 bytes
SHA-256: e575204947d1f78f1cb236211b83074f4774042f6538d15f24da78e987645d8d
font_02_sfnt_off00017f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F32 12824 bytes
SHA-256: ea08490b351d07370808f22fe7f9f708d8f5d26c5845576d4989411a73f0523e

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