Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da4ed479da10f39…

MALICIOUS

PDF

73.0 KB Created: 2021-02-23 17:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0df9b49032d4c485318d1123898443f2 SHA-1: 7faa4c3b268dfe94cfcaadcead5a0ccf20ad8a22 SHA-256: 3da4ed479da10f39261a5c6bebb79257f74e77ce68931975d5502ce737853888
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=is+toshiba+fire+tv+a+smart+tv PDF link annotation
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/parisefupitubutisis.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/heVjaRc/northern_tale_4_walkthrough.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/52b0a835806a.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/semovu.pdfIn PDF document text
    • http://ylyn.ru/bandlab_apk_old_versionpn01i.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/uiahfif/archer_season_11_hulu_release_time.pdfIn PDF document text
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/weredesokiv_mepekogiwusud_bakoke_duzavupovo.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/61752f84b19828.pdfIn PDF document text
    • https://naforuzutexas.weebly.com/uploads/1/3/1/4/131438024/mujivifipew.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/rogolifaviw.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/garipebugejadud-libiralumutupu-batif-larisekijuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kanisal.epizy.com/51096087518.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 5112 bytes
SHA-256: be99552a807f03b9a06b03852e841245a7e7282fe759dd2811265c8895250dcc
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10220 bytes
SHA-256: 369136862c0f096046582da70448cb2f2bae06d87386ec08614e5740e246a645

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