Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b83775944f887c…

MALICIOUS

PDF

71.0 KB Created: 2020-12-25 09:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9464b139afb328f10af07cf97d810cc SHA-1: ed3b40a37137fa7ab03ac4ccd52dabbe67628bb6 SHA-256: d5b83775944f887c2c2b3679456be4dbf760694bb66737351d80d41bf961cfb4
164 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 other PDFs, suggesting a link farm or SEO spamming operation. The presence of a 'download button' heuristic and a critical ClamAV detection for 'Pdf.Phishing.Trojan' indicates a malicious intent to trick users into downloading further malicious content. The embedded URLs likely serve as lures or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=alexa+amazon+apkmirror
    • https://cdn.sqhk.co/situdejoj/Ygfhigc/ratofenevat.pdf
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/53708e169ef.pdf
    • https://cdn.sqhk.co/dofewijoras/iirjdda/zokizi.pdf
    • https://cdn.sqhk.co/pimibopugugo/3Diipxl/gujevezifosomatesuso.pdf
    • https://tuniforokot.weebly.com/uploads/1/3/2/6/132682883/lavibi_kunipogibotebew.pdf
    • https://cdn.sqhk.co/palazawu/rpiL5hf/94524533317.pdf
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/kunenoga.pdf
    • https://cdn.sqhk.co/zenetofuma/S4G0utJ/43918877512.pdf
    • https://cdn.sqhk.co/zatugudaxaji/TNiiier/chicken_tabaka_georgia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jusagi/88447415794.pdf
    • https://s3.amazonaws.com/faduxodiwo/browser_paling_ringan_untuk_android.pdf
    • https://s3.amazonaws.com/wusone/creative_pumpkin_carving_templates.pdf
    • https://s3.amazonaws.com/mexavofezoxi/loan_officer_business_plan_template_free.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_off0000da44.bin
c00a0fce80829aa884ca97ab10b36389c3066f319ea1d6b7e9fca440a5f5e83b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 4960 bytes
font_01_sfnt_off0000eb1d.bin
d5c3cde6587d9edf9a55a3637fcdf71aa1753748c9596329fe842959e4ffb1c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10728 bytes