Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b425de0600494c3…

MALICIOUS

PDF

74.2 KB Created: 2021-03-31 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d51cc23ea80515086e84a5d5fbf77222 SHA-1: d39d6a2a36fccd12f785d48e9eb5db5d5a4da770 SHA-256: 0b425de0600494c3af0175a0e83e5a9360a629cf95a0dff3dd26d0a4b22b9560
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various web services, indicative of a link farm or SEO spam campaign. ClamAV and ML heuristics confirm the malicious nature, specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=sojourner+truth+house
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/17779f870f6bfa.pdf
    • http://xonigej.mypressonline.com/business_administration_and_finance_burlington_books.pdf
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/57e1d644fae9.pdf
    • http://bowanizi.22web.org/modozitozusuvufezuwikam.pdf
    • http://bamefidev.mygamesonline.org/authentic_assessment_tools.pdf
    • http://manovina.mypressonline.com/mezawep.pdf
    • http://dalosizofovabes.medianewsonline.com/51275952251.pdf
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/xerajiranera-dopibemibexixur.pdf
    • http://rexonina.medianewsonline.com/organic_chemistry_volume_2.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/8801827.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kamegil.epizy.com/71956406988.pdf
    • https://s3.amazonaws.com/safenalavojuwu/artaud_obras.pdf
    • https://s3.amazonaws.com/jojitagifuva/57960664536.pdf
    • https://s3.amazonaws.com/bokexizometun/rise_n_shine_song.pdf
    • http://vovakupalujum.onlinewebshop.net/bacterias_gram_negativos.pdf
    • http://jorowubibe.epizy.com/kumotuwekemotiwaf.pdf
    • https://s3.amazonaws.com/rizoli/acer_aspire_7750g_repair_manual.pdf
    • http://wimixuv.epizy.com/how_to_use_excel_sheet_formula.pdf
    • http://tedusola.epizy.com/sazizenuba.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/what_model_rainbow_vacuum_do_i_have.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_off0000e7ae.bin
32acd42df51ea468aa0806a2a9aecc497bf7a299b2e03ac77b8062fa0286775e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 4712 bytes
font_01_sfnt_off0000f7ad.bin
1ef5fcbd0eb0c104821cf56d379e2d9a4c3e9ccc416381622124272e61ad93c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10676 bytes