Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c545e7c352c085…

MALICIOUS

PDF

82.9 KB Created: 2021-04-06 14:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e2b56bec232276426c6aead35edfc016 SHA-1: bf0b628ff07ee43c2fdf1bcd9dac9078c455be5f SHA-256: 25c545e7c352c085105e987881cc8438b0854037340e126f528f5cca8b940227
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://jacksth.ru/award?keyword=shakespeare+sonnet+147+pdf PDF link annotation
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/muzepazufokil-sozurusu-dowexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd79d5ff3080.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/54141638113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_60579ddbba4ff.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/the_little_prince_french_song.pdfIn PDF document text
    • https://robedovetukurur.weebly.com/uploads/1/3/4/7/134754045/jatasajiruxekopofige.pdfIn PDF document text
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/6352605.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/3096035.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/aaf5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ff933b68d3a8.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/mimabimubepidoselogaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_6035ae86699cc.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/oceanography_textbook.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/tujeviwakirawu/delta_37-190_for_sale.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_ae5f7700d20f40439ae17bbf4f7be6ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/kozixija.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_4ed1bd008f6247b5b086d2e37166a194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/88920977171.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_fe4dcd01ef624d3c8e43073d66490265.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_5cec2953b5f94b9f8dfd7aa3b21ccc52.pdf?index=trueIn PDF document text
    • http://viwudajokufado.atwebpages.com/84968338882.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/gujarati_bhajan_song_video.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_5478599eaa0f490693853b37e8bf594f.pdf?index=trueIn 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_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 5484 bytes
SHA-256: 375a37022ca97e34a4384fd59ac16142fc31c06b4a061abd939d2e951634f329
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 10596 bytes
SHA-256: 7e3d8dfe5adc41c16267326759b1a4d6ce54e10a6027c4d82e1dea44483796a4