Malicious PDF — malware analysis report

Static analysis result for SHA-256 934823f1ab995428…

MALICIOUS

PDF

68.5 KB Created: 2021-03-23 05:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6fd75a86aa47936e211529a06987709f SHA-1: 5774a160fbee0b5dad1a782eb90993ac3007d969 SHA-256: 934823f1ab99542824a4a5d2abff2a7804482d56f64fdc44ef3e61ad0ee0e3da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing. One prominent URL, 'https://mezovuduw.ru/wix?keyword=apk+kingo+root+download', suggests a lure to download potentially malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/wix?keyword=apk+kingo+root+download PDF link annotation
    • https://cdn.sqhk.co/bezorufuv/kghfidM/ice_hockey_world_championship_2019_slovakia_schedule.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/budget_preparation_format.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/cGhjNhc/best_free_virus_scanning_software.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/bevekizadoxuj/25283633161.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/rijakoxex.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_3bde12d8d103429b9b426d92fb70cb7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3c2b16-0020-4b50-9893-3f3a60028037/derozidifazosidurakasuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1521391-7693-40d8-9035-775704c09023/garmin_gns_650_xi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719eab93-0c4a-4261-895d-a683674840bc/keurig_k150_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2317119f-2b8c-4fe3-86ea-84918dbaf398/12578601067.pdfIn PDF document text
    • http://dafuwinev.myartsonline.com/8711863516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfcd791-8397-4395-803a-1b87341edf25/disamufuzukaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccabd708-d214-4b9f-a35d-cac47e53ba59/nordictrack_t5_zi_treadmill_weight_limit.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_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 5096 bytes
SHA-256: 8f7bf743299d3667b9878e12d6d976e63dee2acc6494aee027112c863b64013b
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 10204 bytes
SHA-256: 40128d4f70610e0dc2bfddd7f3d219daa2a52ac91ec473f1df2e59a4dda846be

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