Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf813d3cda41f2b1…

MALICIOUS

PDF

73.6 KB Created: 2021-01-08 09:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3551bcdbf418fdd2ccff943bbd664dd8 SHA-1: 7d7a30c74553ad2bd6586f3e9d73d0b218cb0c10 SHA-256: bf813d3cda41f2b1e3f825023b925234b44095683065d62cd039508600837a41
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text related to sheet music and application metadata, likely serving as a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=cantina+band+sheet+music+alto+sax
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/db59ddfbb699.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/3159459.pdf
    • https://rimesukanol.weebly.com/uploads/1/3/4/7/134746435/0e923b.pdf
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/bufar_zupopoleve_vavosirul.pdf
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5ff554d282a81.pdf
    • https://cdn.sqhk.co/luwivimexu/Mhh4ieo/ww2_dogfight_games_ps4.pdf
    • https://xokodozavujug.weebly.com/uploads/1/3/5/3/135343923/8367999.pdf
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/wajulimadug_nujuv_tidofaje.pdf
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/laxini_bidakumiwatat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wufujudisu/handloom_double_bed_sheets.pdf
    • https://uploads.strikinglycdn.com/files/56170707-02ee-4223-8583-a8d99ce582af/75085199755.pdf
    • https://s3.amazonaws.com/zirojopemup/scientific_calculator_functions.pdf
    • https://s3.amazonaws.com/bisapovepizaj/urbanized_documentary_worksheet_answers.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/sudogugosozolovozisatib.pdf
    • https://s3.amazonaws.com/punurum/wepijim.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_off0000e009.bin
35d92f01a0e5f31ae34aa5e329c80d2e91e9466dfe52dbe9f200e5c2c930bdf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 5196 bytes
font_01_sfnt_off0000f191.bin
bac6ac6d4abce498890581ed0bb7784aa1e7521c0fca13cb38e5021d21f94099
pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 12208 bytes