Malicious PDF — malware analysis report

Static analysis result for SHA-256 227978100ed6d60f…

MALICIOUS

PDF

82.2 KB Created: 2021-02-08 01:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2be0290aed80bfc6ded63e9535880009 SHA-1: d5c42c91a19ac0cbbb5a9e2d5c386def284fff82 SHA-256: 227978100ed6d60f7e12a86830279a957099ec1713958f39b33d53d4e40b8e78
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used to obscure malicious destinations and create link farms for SEO manipulation. One of the primary external links, 'https://baarspo.ru/aws?utm_term=basara+2+pc+highly+compressed', suggests a lure for a software download. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were directly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=basara+2+pc+highly+compressed PDF link annotation
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/5254197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470964/normal_5fce016b54aaf.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/bigolopegisofirasode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_6006ad0e83e9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488822/normal_5ffb07a309274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462974/normal_5ffa5d7086c92.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/48898136507.pdfIn PDF document text
    • https://wigowuwadapol.weebly.com/uploads/1/3/5/3/135315864/7640118.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/potamotaz/23903442827.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/vunosunomomotuzipunowalok.pdfIn PDF document text
    • http://telenusu.epizy.com/edible_sugar_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/68800284690.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/kusitekotunavegirabixete.pdfIn PDF document text
    • http://kedokonox.rf.gd/82551486519.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/69732075709.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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 5372 bytes
SHA-256: 3334ed4ae797e437e7fe296d225a5513f259d972982e73b0f7fb78d1e668a06d
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 12044 bytes
SHA-256: 3689f1b422fdf90ac2851216bee6d808ccb2c388115aa3a380685ae19a678adb
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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