Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1aac0471a7af06c…

MALICIOUS

PDF

74.4 KB Created: 2021-05-20 01:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c7b633980255a6577b73bce2d1edf9b SHA-1: 4012151a978bb9e9a7879fd53eee5b02c552d8c3 SHA-256: d1aac0471a7af06c5ab94edd5726cde8f0c3a9cd8c2cdde2e48c3a6201f808f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, https://kuzutuzo.ru/strik?utm_term=how+to+hack+bee+swarm+simulator, indicates a lure related to hacking. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://kuzutuzo.ru/strik?utm_term=how+to+hack+bee+swarm+simulator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374838/normal_605ffb0295c10.pdfIn PDF document text
    • https://jipubegu.weebly.com/uploads/1/3/1/0/131070098/nukewew.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/c60cd1f.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/xajamuk.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/mafizemovubud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fc8d62237c00.pdfIn PDF document text
    • https://fivubiforozoxi.weebly.com/uploads/1/3/4/6/134676017/jetusasuj-dofefegog.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/6731011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5feba9d350f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_605b8d108cf0b.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/8206052.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/zumunekow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_60571541322e6.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/kobugak-vewibewilufim-ronedunesoxokov-wudutabadewir.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/dotivaf/viworegudupivuwanupefaxew.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/chapter_13_basics_of_electricity_milady_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/86816460644.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/school_uniforms_stores_in_quezon_city.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dopizogu.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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 5296 bytes
SHA-256: 692c861b2f5d986b43fbe60a3eef78dc6f49b68925fb968a3fb1b95f73476727
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 10256 bytes
SHA-256: 45cef6c561d1708d172bd48dad1b73d35315176d8537ee23e12d79d9dda6f3a0

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