Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca01615a78c6855f…

MALICIOUS

PDF

84.4 KB Created: 2021-02-23 07:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 68f3db8b2e2d1c9b6a4021b2b670a2e1 SHA-1: 4cc2c549177e0c0d271f5b8ca09100df1db54c40 SHA-256: ca01615a78c6855fe8548c7653de6ac8c963e180eee3f5914ca216399ac0a6a6
234 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying it as a redirector link to a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PRC/3D content and embedded URLs further supports the classification as a malicious PDF, likely used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=statistics+4th+edition+david+freedman In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_600a29f9ab284.pdfIn PDF document text
    • http://tosety.xyz/41334234821kjhep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407057/normal_5fec40fe77421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_60155681c7164.pdfIn PDF document text
    • http://maximizator.online/watch_hbo_max_on_roku_hack0nctw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_60257d810c991.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/8rjgidA/26075573489.pdfIn PDF document text
    • http://help-nanny.site/baby_driver_free_online_streamingfygq1.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/iyic4ia/how_to_redeem_roblox_gift_card_from_target.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/6590265.pdfIn PDF document text
    • http://micrometer25bill.site/rca_rt2781hb_user_manualfay0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/taiwan_visa_application_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/28403359057.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/pause_onedrive_sync_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/84290820189.pdfIn PDF document text
    • http://xilavivugup.epizy.com/pagapavinafujepojavome.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/85087557212.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 5480 bytes
SHA-256: 92a8921b3dc273fe64ae10a2af9f0439afa8c3220741f980d0fbf0b6d4f80b70
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 11320 bytes
SHA-256: 6b2294c60273fcaf68a444efe79a8cbfe63fed4958078e4beb4532a5d1fe84ef
font_02_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 16108 bytes
SHA-256: 486c9277b80dc77390169b21a66c4a0f409b1965525d37f2f2140c694b7a62d4

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