Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3661aa4d8952c82…

MALICIOUS

PDF

86.1 KB Created: 2021-05-25 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c49d9ada72d6f400ab21008935ccba4 SHA-1: 5cc73e594f290a388f601d5e7dd6d9f5a8cd80d9 SHA-256: f3661aa4d8952c828945357b583900bdef19f74c07e1cbac8df1e4b0075a4ad1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or to redirect users to potentially malicious content hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=murci%25C3%25A9lago+es+aguda+llana+o+esdr%25C3%25BAjula
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/7832967.pdf
    • https://rovizefodizare.weebly.com/uploads/1/3/4/3/134309954/mozapofowuwima.pdf
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fe3fa5e5bc0e.pdf
    • https://neminijovasagig.weebly.com/uploads/1/3/4/6/134603544/fuwobajegaduruz.pdf
    • https://gifimaxenewurup.weebly.com/uploads/1/3/4/4/134458705/0f33c5feb88abc5.pdf
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/8919156.pdf
    • https://vuvoxuwamulixa.weebly.com/uploads/1/3/0/7/130739220/5402959.pdf
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/9234338.pdf
    • https://static.s123-cdn-static.com/uploads/4383295/normal_5ff7ced15ada0.pdf
    • https://static.s123-cdn-static.com/uploads/4452206/normal_5ff8eb81a0c72.pdf
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/jisut_zasugar_vebeler_wavosifetijow.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_604cd2088b321.pdf
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/4137592.pdf
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/6193400.pdf
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/1c8d65b45a980f2.pdf
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/sewiboduvuredof-wesaxo.pdf
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/1140279.pdf
    • https://guroposuz.weebly.com/uploads/1/3/4/4/134469393/lawobivu.pdf
    • https://static.s123-cdn-static.com/uploads/4375073/normal_6006365216d36.pdf
    • https://lubojedibejet.weebly.com/uploads/1/3/5/3/135329630/7734528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xewamejixolefaj/chinese_new_year_greetings_video.pdf
    • https://s3.amazonaws.com/zarusegibitumet/vodijukezifa.pdf
    • https://s3.amazonaws.com/paropabaru/westminster_shorter_catechism_number_87.pdf
    • https://s3.amazonaws.com/wuxupewu/69164318625.pdf
    • https://s3.amazonaws.com/lopeteb/lekuvobunumanavisilanir.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin
e7087453eb71581b638b79e65a40c239983c7178b8f552972f0973257c444741
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5248 bytes
font_01_sfnt_off0000fe33.bin
b47fdf9ca39cd6779586b0a34509f0c762cc0dd2ef79ea0034a19a4d09080d61
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 12156 bytes
font_02_sfnt_off000125a4.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 16036 bytes
font_03_sfnt_off00013a0c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0C 4324 bytes