Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1083e6e40c6c97…

MALICIOUS

PDF

71.4 KB Created: 2020-12-31 15:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5344f3b998cb9c67490917470240ed02 SHA-1: 96eab6c34bb61a8e3256019c161a33457a4a6add SHA-256: 5e1083e6e40c6c97f8266a1678fe42f6f2a06853ca6463fd1269618040096582
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly and S3 domains, suggesting a link farm or redirection mechanism. The primary external URI, 'https://trafffi.ru/strik?utm_term=excel+2016+freeze+panes+shortcut', appears to be a lure, potentially leading to a phishing site or malware download. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=excel+2016+freeze+panes+shortcut PDF link annotation
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/zusebu.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/vetisa.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/mopal_gikaralemubelu_molakudebawedef.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/2010093.pdfIn PDF document text
    • https://resodapiperuxa.weebly.com/uploads/1/3/1/4/131407292/vawipen.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://uploads.strikinglycdn.com/files/200dad4b-7a5f-4b7a-9d85-b973bd6cf1d1/tibineju.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/av_test_security_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/wuxedufere.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/ajio_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76168ce-dcd9-4498-bb71-227389fad568/zekixosuse.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/release_date_of_minecraft_cave_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963bb944-ad99-4fb9-a247-b550b66fddf9/kinamin.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/76695646862.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 5492 bytes
SHA-256: b459d05a9058d8b3f2333731e8896dd80b9eefdf597fa2124204660d610f9c9b
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 10900 bytes
SHA-256: a991ab08580eee86d3c31e4d5bf4fbc112b126eb2dd6ff849909e49601d5d85d
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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