Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad04b9e53ccbd0db…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 15:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13174c5521c34c871cff9fcc9808cca2 SHA-1: 95138249398c2526a334420b1ff42200f87dcb4a SHA-256: ad04b9e53ccbd0dbfe38e16eea51e2d601e52689a67ecade1742a7b6d1ed9701
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 0.9990

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://midufefew.ru/aws?utm_term=how+to+do+editing+and+proofreading PDF link annotation
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/vusoputidaf.pdfIn PDF document text
    • https://pegutezupo.weebly.com/uploads/1/3/2/7/132740329/zewopal-bovefefilum-bilasifa-tivuwezebabo.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/f7d478f6.pdfIn PDF document text
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/givoliwaze.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/57984607623.pdfIn PDF document text
    • http://tugofexofuwaza.22web.org/11_22_63_trailer_deutsch.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/votawawo/reseven.pdfIn PDF document text
    • http://topazavagujefit.epizy.com/circus_tent_image_free.pdfIn PDF document text
    • http://lofekelatek.epizy.com/archidoxis_magicae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49aefbac-9b5d-4a0c-abda-0ecfd115b445/what_are_the_animal_names_in_jungle_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc8ccd2-22ce-4c76-813d-c33b83b63960/wasokixipogubixowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071377b8-fe4c-4604-b1ae-d3eefc750ad1/zezevigekidogekixeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e661c3-2f69-4314-93a5-ead91d73272b/45315541351.pdfIn PDF document text
    • http://wulumafagupiw.rf.gd/sanidry_xp_manual.pdfIn PDF document text
    • http://redusaboj.epizy.com/cephalosporins_generations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4879d620-f901-4194-b98d-e22e849ca560/49867605547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d67db7d-5026-4e2a-9b1e-9b98fac4ac63/autotrol_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d28119-966f-4411-9a64-d9509bfecf87/tukujuvikubevekozibiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d66ecf-391f-4dd5-9433-adb8a75c1b24/muwidukuwuporesapom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0af6ca1-9f26-4077-b71e-3b9365386702/pezesasikitedoruxixi.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/vanaspati_jagat_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/bangladeshi_comedy_hd_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/4036255345.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/sound_wave_equation.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/sizujivexipipagekujajanax.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_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 5052 bytes
SHA-256: 2f305b026f9585a7ebbbd6ef6c517698b71a2af684a8c4afb019442d07528a72
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10232 bytes
SHA-256: bcfdeb22d4c22c88adb1d189a50a17a430c8289cebbcb17e7e23e8704b06ee6e