Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ba8fac16c72b0c…

MALICIOUS

PDF

85.2 KB Created: 2021-02-19 18:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f86d9cc7e00733c667f7d4f4527881ee SHA-1: 8a5f4371656aa2aed493455e2ec57ed5077c4343 SHA-256: d9ba8fac16c72b0ca335d04bfdac5447e4a19c78ffaeec0748d1c4ee09868155
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 detected as malicious by ClamAV and an ML classifier, and contains a large number of external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains text suggesting it is a "moon phase tracker worksheet", which is likely a lure to encourage users to click on the embedded malicious URLs. No scripts were extracted, but the presence of numerous external links points towards a phishing or traffic-generation scheme.

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://bologen.ru/strik?utm_term=moon+phase+tracker+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413374/normal_602e32ddcda15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fc8572173f87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fff0975212cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6027c08cc8f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_601b57c97993a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5fd191505717a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_600c136d28876.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/podumuvomojasevukibi.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/wujul_zabazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5fd159af0d30b.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/ab5e04d5d4.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/3148931.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/dojonuta/salaam_rocky_bhai_full_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/asharamayan_path_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/11963564757.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/4020913382.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/levojadinufemonosoga.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/nih_laboratory_design_guidelines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 5152 bytes
SHA-256: 4bc76700c6c6a9818120a8ff213b597b414d79f9176dec3d0ea80db746a170c3
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 12432 bytes
SHA-256: 1a6e5ded2ad2f5c22975acc5539ac165c7e70eb17d9a504b295000212590a61a
font_02_sfnt_off000132b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 16068 bytes
SHA-256: 5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8

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