Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f560ce487b2a8a5…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 20:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6d0b7adb044cbb0a63394f48e9fbda40 SHA-1: 43f7fdaa5d8b6fa8cb00aee796a7f78440f53a0e SHA-256: 8f560ce487b2a8a5603f38721a62d0366fcd7459ffe8e3e4794434d2951b7bd6
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. One prominent URL, https://mezovuduw.ru/strik, is presented in a context suggesting a lure for users searching for children's books. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=where%2527s+waldo+type+books+for+toddlers PDF link annotation
    • http://ledekajigibinad.22web.org/61966446878.pdfIn PDF document text
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/8dd557.pdfIn PDF document text
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/mozewawexap_delimes_tologor.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/is_the_four_agreements_a_christian_book.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/12859546428.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/jenebomadijodip.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/najibuxulinakoliji.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/xebuvuwov/bibliography_mla_format_website.pdfIn PDF document text
    • http://roveramo.atwebpages.com/how_to_change_battery_in_first_alert_smoke_and_co_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/creature_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/blackberry_classic_touch_screen_sensitivity.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/3735217938.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/zotajugalopive.pdfIn PDF document text
    • http://lodaxiku.rf.gd/vetewemu.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/best_business_management_books.pdfIn PDF document text
    • http://bibuligo.epizy.com/58011257341.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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 5572 bytes
SHA-256: 4e13247165efb2e8d7fbbea9655526b336ece58becf4d7a964d3e1dbc5bd1dee
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10204 bytes
SHA-256: c8392737f76dcb56fec3f6bec9456b965226295b6285e3f9fee0426d5f1b3b51

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