Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a6c74d1bea3303…

MALICIOUS

PDF

97.8 KB Created: 2021-03-18 21:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe3b9b0c305ffd2c93b8d9264f781ad1 SHA-1: 745c3f468a7b70132ed4111f2190d1a72315f7e3 SHA-256: b6a6c74d1bea33034155d31ee793cef8f8fb902eb709c72bc350f8508316a481
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=mr.+knightley+quotes
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/4857603.pdf
    • https://static.s123-cdn-static.com/uploads/4421939/normal_5fced9372c47a.pdf
    • https://static.s123-cdn-static.com/uploads/4420764/normal_6008a12d9e0f9.pdf
    • https://cdn-cms.f-static.net/uploads/4413474/normal_604459ca58997.pdf
    • https://cdn-cms.f-static.net/uploads/4369310/normal_603f175a3d5c0.pdf
    • https://pobizaxorede.weebly.com/uploads/1/3/2/6/132696020/0d7de6be.pdf
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5ff53225ba6fd.pdf
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6013c4bee8eee.pdf
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5ff75be901010.pdf
    • https://cdn-cms.f-static.net/uploads/4485176/normal_604fe7ff9d55e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molumazorok.rf.gd/nuguratarobigiditabefokav.pdf
    • http://puzulipanaro.epizy.com/classification_of_arthropods_answer_sheet.pdf
    • https://s3.amazonaws.com/rufonali/63003740912.pdf
    • https://s3.amazonaws.com/xiwevitox/bosch_laser_measure_glm_40_manual.pdf
    • https://s3.amazonaws.com/satedafadusizo/tibosivukitixaxawe.pdf
    • https://s3.amazonaws.com/sizadagazagaj/favuretotak.pdf
    • https://s3.amazonaws.com/bakoloj/cbse_examination_bye_laws_2018.pdf
    • http://tetexabe.epizy.com/acestream_media_player_apk.pdf
    • https://s3.amazonaws.com/xifabilejilab/pakatan_harapan_manifesto_2018_english.pdf
    • https://s3.amazonaws.com/wonumafubij/85396751981.pdf
    • https://s3.amazonaws.com/jevedijadiki/92173691271.pdf
    • http://kisomelug.rf.gd/watepisa.pdf
    • https://s3.amazonaws.com/divexikav/nojevakakuvewulo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014208.bin
aea6e69c07b495cd94c25315ccbb6ae5fe96a0d4440a97e5b5f975972626b3cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14208 5064 bytes
font_01_sfnt_off0001535a.bin
254fdf390c22dffee42040eba2fa01ac0e317c530da28c6519cc410eedc679b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1535A 10860 bytes

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