Malicious PDF — malware analysis report

Static analysis result for SHA-256 3980d140f040c2e9…

MALICIOUS

PDF

71.2 KB Created: 2021-03-03 06:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77feb08e793ab10ed7984bc47dd35a22 SHA-1: eba7ad05a01ace3d26c1629ca4f56c278dab9ee2 SHA-256: 3980d140f040c2e944ad9f182c6d36d90ca65f4b37fe050f86d87a27c67947a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also identified it as malicious. Although no scripts were extracted, the presence of numerous external URLs, including one pointing to a potential phishing domain (resalured.ru), indicates a malicious intent to redirect users to other potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=envision+math+grade+3+workbook+pdf PDF link annotation
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/kivifusak.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/Jjbgidx/49356897016.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/WNb5gJQ/26259872372.pdfIn PDF document text
    • https://tikekukitalil.weebly.com/uploads/1/3/2/7/132712015/ea7e9c.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/91hggeB/us_movie_box_office.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/5yjcUih/99872270673.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/Shhr7bT/kiniruzonowakiw.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/filosofia_del_derecho_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/7hahlXP/happy_chef_restaurant_mankato.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/chjBnhj/motopuziwoluwidabit.pdfIn PDF document text
    • https://minizaderi.weebly.com/uploads/1/3/4/3/134344024/xukarevuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/Djfgfgg/mikozaxubevodulisi.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/mupukesunobaga/bowotogoxoworuko.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/62257032240.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/are_yardworks_snow_blowers_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/1097270792.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/android_studio_jdk_location_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/what_is_habit_reversal.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/76291482349.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/asperger_2018.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_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 5688 bytes
SHA-256: 95791d1a1c01ee5ad8b2c42ebedea66b8bef1287402151796d70023e3aa62f27
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 10672 bytes
SHA-256: 38d8da1d0cf61c4fe536b160e2f967e8ed29048c68580be5a742c500e58c9e5b
font_02_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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