Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ca92ab2c2b94d4…

MALICIOUS

PDF

62.4 KB Created: 2020-12-31 02:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ed04efa35d1c3b461c9c74f2a0b142d7 SHA-1: 1c066d59e5bfc48d519df082fe09180c9c5af290 SHA-256: a8ca92ab2c2b94d479174ea3a7360f90e5fb2865477bd3ff2d03a4c21f740615
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms designed to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain keywords related to product names, suggesting a lure for users searching for those items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=camp+chef+flat+top+grill+475 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5fd6f11d1fc87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5f98fee117eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f9273c747c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5fdc44b1813c3.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/SNJha8p/meme_soundboard_ultimate_2018_pro_apk.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/fufewerewitukis-pavori-fodamuturefosa-fagex.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/idhf2ia/cute_green_frog_emoji_stickers.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/bekadubeku.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/iejgiiS/85933508800.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/zatazewoz/free_folder_colorizer_software.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_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 5448 bytes
SHA-256: 694d26cda20b71698eea35b459ecb6cdf47a28370840a73bc880d46cc8a67ae4
font_01_sfnt_off0000c7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 10848 bytes
SHA-256: 1c5bd9a7a75dc3f05cbdfd251f26fb568e3414a7f0732b7666bce281a9efe36c

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