Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d242c1269827a50…

MALICIOUS

PDF

77.9 KB Created: 2021-05-22 13:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 62a1b2d7ff3d09eb2120531e60867ecb SHA-1: ac1317d9fbc997634572160333177ff083727d05 SHA-256: 7d242c1269827a505fb552181de3aeb04d802ac85a204d077491e3e96e1cc842
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though truncated, suggests a lure related to 'revision notes PDF'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=cie+igcse+biology+revision+notes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ffa781e77fa5.pdfIn PDF document text
    • https://xotototovizeta.weebly.com/uploads/1/3/2/3/132303406/6d9a966efc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495860/normal_60043e01d6b21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490364/normal_6000611aa0c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_601ef5785d27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_60292270cf805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd711ce3baff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_60075f0cb635d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5ffc9e549d179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_602d035312bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fd3a26a1fc43.pdfIn PDF document text
    • https://tulijibukabez.weebly.com/uploads/1/3/0/8/130814483/b10ed65faadca93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_601f5b886d28f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60659a1f9deb3.pdfIn PDF document text
    • https://sanositew.weebly.com/uploads/1/3/1/8/131872303/d2f3f759cd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_6011ce30aeabd.pdfIn PDF document text
    • https://fulitadu.weebly.com/uploads/1/3/4/8/134863398/tesowaxizefogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6055e05f032c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_604325a8aae72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5ff7f11547026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530578/normal_5fcd7b400b9dd.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/miwolezedubujoz/66196824568.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/4622526304.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/xekemavoniwom.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/butamemobezibujaler.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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 5320 bytes
SHA-256: 24ea53ddab0a52e2bd70335003c3f6cb3a15e34f1956de463da07a0b424826e6
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10928 bytes
SHA-256: a5e0eb1f0f2ab1a2b5dfccc57e2129806228652536685c1663b15621bc4efa9d

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