Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2297bf20dd63b45…

MALICIOUS

PDF

78.2 KB Created: 2020-12-23 19:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 460d68255ef751f42c3e9adc662fc68b SHA-1: eedeb46d428b211134d39bf1724cc4433ec9d13c SHA-256: b2297bf20dd63b45ce8f48be9c1d13118567fff77143626c88fd28b6d062b862
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on file-sharing services and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Skype tieng viet cho pc'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware via the numerous embedded URLs.

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
  • 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://trafftec.ru/aws?utm_term=skype+tieng+viet+cho+pc PDF link annotation
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/2c69d5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_5fcb719b3931f.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/taketupuwevawevuziv.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/dijjahj/7926652911.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/Gifjcjg/81795713408.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/LziHpgd/my_talking_cat_koko_mod_apk_rexdi._com.pdfIn 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://s3.amazonaws.com/bofake/60116800496.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/vex_iq_2020_game_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/jibebifoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/wurazododijakagadusomev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f397bbda-c35f-45ce-93de-474edece952e/pemigemegobenuxalubawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e607e8-5fce-473a-a55b-821968386056/firowogajizarira.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/idiots_guide_to_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/ivanti_workspace_control_admin_guide.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 4796 bytes
SHA-256: dfb7afbf2f16e169f92ddd6882e0c8fec2d5697208bdb0a0061c9d613e9f9484
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 10672 bytes
SHA-256: 065a480cb4e78457dc746eb114a1117aca6b977a29ccd2c626c6be0a64120b9b
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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