Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b32b1f1978220f5…

MALICIOUS

PDF

97.0 KB Created: 2020-12-26 04:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 38e3c3112ecc8418fa9054165785c662 SHA-1: c7e791ce814d2b95622e5f7aa9071c5fd08fc4b9 SHA-256: 9b32b1f1978220f594d478784810a03dd18cdcac5fd4e1c03f82b24f66dbe734
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://cctraff.ru/strik?utm_term=domino%2527+s+delivery+driver+pay+2020 In PDF document text
    • https://dopolijakom.weebly.com/uploads/1/3/4/5/134527788/xifejav_lolebusakojana_jasujobitile.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/6sekRje/15063190587.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/ahaidxL/emoji_art_copy_and_paste_dirty.pdfIn PDF document text
    • https://compare-autoinsuranceIn 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://uploads.strikinglycdn.com/files/275381eb-ebdf-4eef-9878-9ac593a6c667/the_obstacle_is_the_way_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73927ae6-49e1-4676-aec1-47d0576de1fa/84169549373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb923e3-a2cc-4a49-bfca-2ea0271b75e5/wopib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734373f3-8172-4317-8177-19994943a39c/importing_excel_into_access_search_key_not_found.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3ce991-35d7-4936-9d25-99718d05f8a9/laket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104dc261-686a-45bd-aab3-eb968055280e/rubrica_para_evaluar_una_entrevista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0804a462-6a19-43df-814f-ee90c277ef89/gaborazanojuxuperalepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b5c9b2-a048-46e6-a995-e3fa275631e9/frontal_release_signs_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e524810-2ce3-4406-acae-e14757857524/wuledilewuwim.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_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 5280 bytes
SHA-256: 1206caaae3133d3671c9bc43255f1e64028c8b45de7b08f60e2c9693ba44de56
font_01_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 11908 bytes
SHA-256: 642e91b04f958de291998f5d534af6912cfca0e482fd81b802eab39801a0bc40
font_02_sfnt_off00016887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16887 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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