Malicious PDF — malware analysis report

Static analysis result for SHA-256 b400309b56a34d31…

MALICIOUS

PDF

75.1 KB Created: 2021-02-13 18:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d3ff105039e7b077b7bd184637009157 SHA-1: e7d2fac9f693e813dd871e4056d64d39e3b5fc7b SHA-256: b400309b56a34d3188bd88cc59f47e13a5aff7d6a98e2ca3769f02343e7930ad
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The embedded URLs suggest an attempt to direct users to potentially malicious content or SEO manipulation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/wix?keyword=unit+1a+unit+circle+test+review+worksheet+answers PDF link annotation
    • https://nadebexipopajin.weebly.com/uploads/1/3/4/6/134678264/gojidalogi_fusodovabozabo_firedoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fe485db3cadf.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/43690925bab8039.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/hgji4ic/11803246216.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/jjqjcgg/56680848016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_60026b9e5cf43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_60243ee2e847a.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/7rHOWid/38981303371.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/jehigid/pisubisuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5fd8286204750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fca0596514a5.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/kled_build_guide_aram.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/W3OnZVh/caillou_goodnight_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/Vnhh5tX/zombie_gun_fire_apk_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwijez.rf.gd/sociology_a_level_revision_guide.pdfIn PDF document text
    • http://texatopewewew.epizy.com/58547133862.pdfIn PDF document text
    • http://bolomubimuga.rf.gd/daloxejepajiginemoji.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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 5148 bytes
SHA-256: 733c2f28b4a2fce010a3b86625f2e002e8c62ac518f0f66e5cd98a24759b906d
font_01_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 10284 bytes
SHA-256: 5c5a3325da28deb7deedd3e4b9305dc81665aeefaa99e8717941e185157c1ab5
font_02_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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