Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7a91991f5f6d0e…

MALICIOUS

PDF

70.4 KB Created: 2020-12-23 21:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45b9f688b1623937a5f6a7a0a3b41ef1 SHA-1: 17476d86d558cb5dff1093032760205bf8eed8f7 SHA-256: 0c7a91991f5f6d0e38ae76a8f55d88d09482ef31becbbfe91b71440206c317d7
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL points to a domain known for distributing malicious content, suggesting a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=a+drastic+way+to+diet+page+88+answers
    • https://cdn.sqhk.co/nutakurij/Ojbdjfl/walking_dead_game_characters_names.pdf
    • https://cdn.sqhk.co/jevipugirofi/Ahc5ggo/bloons_td_battles_4_hacked_unblocked.pdf
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/7460831.pdf
    • https://cdn.sqhk.co/kokowoxiwi/Cjeojii/26203032906.pdf
    • https://cdn-cms.f-static.net/uploads/4494146/normal_5fbdc701c1438.pdf
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fc25624611ba.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/tibefanudab_bejajizile_toxer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85dc2846-fa92-4fe0-a683-71cee1d115dc/3973716541.pdf
    • https://s3.amazonaws.com/jupudizadid/wallpaper_spongebob_untuk_android.pdf
    • https://s3.amazonaws.com/potamotaz/cf_lumen_pro_3._70_apk.pdf
    • https://uploads.strikinglycdn.com/files/feca8a83-e20f-461e-96e3-7e3995d28627/xmodgames_apk_download_apkmirror.pdf
    • https://uploads.strikinglycdn.com/files/1f68524e-4a49-4607-89de-9f30e86d2a53/the_omnibus_budget_reconciliation_act_of_1987_affects_which_group_of_patients.pdf
    • https://s3.amazonaws.com/susopuzupure/letezupeze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9dc.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 2900 bytes
font_01_sfnt_off0000d41f.bin
7d451fc8382e7a10f601411995e0b50e12844a19001a15883362d3a28824339d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 5588 bytes
font_02_sfnt_off0000e74f.bin
4fd388dfca7d698224823359c80067908de7197f6d1c6dfa13c154d147bccb37
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10356 bytes