Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4e8768c4d28c27…

MALICIOUS

PDF

71.9 KB Created: 2020-11-18 16:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fa099731eb8830181cf056e878aa1d72 SHA-1: d52194b02645574ef0f6c4fe59408c00e1367322 SHA-256: 5b4e8768c4d28c27a9e8aaee6c9d80317c30491f6512d492425f28c369c099f5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to malicious sites, consistent with phishing or malware distribution. ClamAV also detected this file as a phishing trojan.

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=thieves+world+pdf In PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/nedipusuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5f94916ac9bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5f98b15e67cf2.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/1a0bb2d.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/xamafovigufowoso.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/woruzokonugizutoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8ac40b328aa.pdfIn PDF document text
    • https://rasiporimi.weebly.com/uploads/1/3/4/6/134614798/1430900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7cf33f-20ee-41e7-90ea-c2f05a96eabe/suits_season_6_episode_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0051e1bc-8097-4d66-9ee5-6281b09077cc/redskins_training_camp_schedule_open_to_public.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a1faf6-be34-4ac7-921a-a28c27e145d8/vabadenitubivekano.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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 5020 bytes
SHA-256: e00502dbc6a7ff7a43600eddb643a85ef4ca9dfb73fe26635cd104487164fe53
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 10836 bytes
SHA-256: 5389dbd87bdcb26c68e86015c7f5c94f478b8a281e33403529e7bae1525f6793

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