Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc57ccbd1764b9b2…

MALICIOUS

PDF

73.4 KB Created: 2021-03-06 15:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45b3216f2e406e7bddc7ca7c7e69095b SHA-1: d4882c48e67939833583e40eb10fd3229ad7a4a7 SHA-256: dc57ccbd1764b9b249400d402608110919888d16e91a64119a4558f3fa8f800f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/aws?utm_term=george+foreman+grill+removable+plates+replacement PDF link annotation
    • http://romeita.space/como_construir_una_bomba_de_ariete8xewb.pdfIn PDF document text
    • https://dugaxopi.weebly.com/uploads/1/3/5/3/135305828/rubakowo-biwibigevo-darosam-lobewoguzagis.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jZieBBg/79601635243.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/hgnnuhf/90723797368.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jdjeGhd/crash_of_cars_in_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/hyLkhch/gegonolososekabovizowevo.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/iW8hjKp/biwifi.pdfIn PDF document text
    • http://optalpha.com/small_block_chevy_race_motors_for_saleuhtuv.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/44258924584.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/tigatozovufi_rezofila_figozowisi.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/2bb8cd280acb51.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/62738647249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarepos.onlinewebshop.net/mit_mapping_lab.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/didojaram.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/nizatofomewera.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/wikugotopowatuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2f6629-3713-4e15-8922-7e04f326f41d/the_laramie_project_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bc40ab-6505-400c-93cb-95fcaf4ac59c/dalimawilarogaxudujoz.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/18836053131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666aae1e-c45c-408d-a7b8-0f76212af44d/can_you_put_vinyl_sticker_on_wood.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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 3008 bytes
SHA-256: d2a31de99f6aa32c3fc9e73d04cd36cd4a144f7150529410b1fcee9c257c398f
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 5564 bytes
SHA-256: 2246b785eb832a3b60eb616a19bbf5628de8668559553e5f4d501b6a2b0a717c
font_02_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 9984 bytes
SHA-256: 9a9fe7aaac695f5e36fd923d620a5f7e68ded9e63f3c64a2c5cadf930c5eff44