Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a657e5b4f4600f1…

MALICIOUS

PDF

78.3 KB Created: 2021-05-14 04:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c3bf3d3a62ad6e2a87875a7aeff9969 SHA-1: 5abf70e59b6323597b0aadc4b52f490474ddc6b9 SHA-256: 8a657e5b4f4600f1c42fd98dddd06d08211f1435616f9a6ab69e423e7e1ab97e
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 0.9996

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://vilenefex.ru/strik?utm_term=dirt+devil+model+103 PDF link annotation
    • http://wowitaly.pro/bebinapegotevuvse8l5.pdfIn PDF document text
    • http://ductsunlimitedins.com/water_tanks_for_sale_near_mel2k11.pdfIn PDF document text
    • http://winoorama.website/sustainable_development_goals_of_united_nationsxh7at.pdfIn PDF document text
    • http://help-service-support.com/14581648770p61nu.pdfIn PDF document text
    • http://coolvdomaion.online/1992_johnson_25_hp_carburetor_adjustmentpyrbx.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/8ehjj5W/92614765743.pdfIn PDF document text
    • http://apelsins.space/76643814211sgk5l.pdfIn PDF document text
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/5740081.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/jE4igfj/girimuzelanitefod.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/iiiaEif/57340502251.pdfIn PDF document text
    • http://xoviwuxadufe.iblogger.org/xubonowasimuk.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/3658178.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/ijhhjif/sirufel.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/uvjaicx/vifajutogixijoxakopuw.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/dcd98d.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/lvirRhj/distance_and_area_measurement_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/ght96Sk/save_earth_pictures_with_slogans.pdfIn PDF document text
    • http://fb-ig-copyright.com/rutitopevixulitelafqeb40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabiredozu.rf.gd/xovemabudi.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/mcps_school_calendar_2020_19.pdfIn PDF document text
    • http://bitijati.epizy.com/why_does_digital_transformation_fail.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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 5000 bytes
SHA-256: 259808809faf185a98c17e60a02ad5f8ce1f9ed457d31e6a33e7754d9909e15f
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11772 bytes
SHA-256: 06de7187ac673f84851d378ebb469798854e8548e6905c39eccf3696c20202ad

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