Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25ea0492619b202…

MALICIOUS

PDF

69.7 KB Created: 2020-12-09 05:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 69e2c76c5f50b4b30adc8125516b678a SHA-1: 5c221df4632e6458f2edf7b74634660cfe8cb2f1 SHA-256: d25ea0492619b202ab7b3651ef207a220addaf11d93bf7f5e2ed919a81912035
252 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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
  • 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://cctraff.ru/strik?utm_term=gta+apk+full In PDF document text
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/e9c228ebda12.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/2538516.pdfIn PDF document text
    • https://kiretadipul.weebly.com/uploads/1/3/4/0/134040802/a660fff1.pdfIn PDF document text
    • https://gusilurilusod.weebly.com/uploads/1/3/4/4/134480619/9880177.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/dabebupupi.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/8016352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fc49c3bdf780.pdfIn PDF document text
    • https://bujegeti.weebly.com/uploads/1/3/4/3/134355457/169a5990db.pdfIn PDF document text
    • https://geguromivakof.weebly.com/uploads/1/3/4/3/134332909/bb9e23e19.pdfIn PDF document text
    • https://xezefamije.weebly.com/uploads/1/3/4/3/134352880/kulipuvujabukutam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc13e7dd49dd12447366960/t/5fca09938d0ac92c7be85117/1607076244497/87337054797.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5bfcda3bf4b14abca621e/t/5fc65e232dd96f5918c69782/1606835747932/ketigulukopexom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f578edd-21cc-4e2a-893e-e0fa781cf41d/why_do_dogs_lick_vaginas.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 4216 bytes
SHA-256: 054e33122390b65656fbe80837051bcd5a11710f62372494d18a330fb66cf0b4
font_01_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 10176 bytes
SHA-256: b2957aea663cf9df9aea55e874418baf27356f934dbba27cf4a14447f40b8ead
font_02_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378