Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a6df2dba3f1d8b…

MALICIOUS

PDF

79.9 KB Created: 2021-04-24 04:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d9761158ee47a7fe64cdebdaf8d5019 SHA-1: b056f78dcbaf1f3f83217fff79107a5047226626 SHA-256: 98a6df2dba3f1d8ba92d2a14b4a0ce1a9e55120bc746b7d2bb2f360e0ba9fd7f
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 0.9993

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://nipisod.ru/strik?utm_term=why+was+dorian+gray+banned PDF link annotation
    • http://fapseo.ru/vamutebajutuvalupunes4twsy.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/iijaifR/37780231910.pdfIn PDF document text
    • http://my-favshope.online/budopejejebeberovavx37ks.pdfIn PDF document text
    • http://raisinshub.club/26639469338yjq6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fd76c0594534.pdfIn PDF document text
    • http://kyhni.site/quartz_job_scheduling_framework_download07j9e.pdfIn PDF document text
    • http://repaircreditscore.info/kobalt_tile_saw_drain_plug1i2n5.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/3781076.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/stgfhjW/artist_website_design_templates.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/71cf5d2cb.pdfIn PDF document text
    • http://repair-foto.ru/home_assistant_raspberry_pi_zero_camera2h1zn.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/ehiLqgg/95250709682.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/IjeGsHX/evacuation_zones_lane_county.pdfIn PDF document text
    • https://folumenudi.weebly.com/uploads/1/3/2/6/132681426/8282049.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/wefag-jejakubir-karumusinebu-wuzuwubif.pdfIn PDF document text
    • https://wodekatim.weebly.com/uploads/1/3/1/4/131405934/f322252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_601eb1b44c89a.pdfIn PDF document text
    • http://servicesforsupport.com/superajakkt110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_603825c86710c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_fb6fc9d327694a5ebbf9fd8b3551e856.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_cadca9961eea42b697d86b73c5848faf.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_7d6c8477b80347fcbecb40cc0f51b16e.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_c9e4b03fe57842568b374247f55f5be1.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_2a9982cb6b5d498689960a5e3d7cf8e2.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_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 5400 bytes
SHA-256: ca428071adc4a0270e4445b2e01cf32231ede07450871d25d978ae12ff629d3a
font_01_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 10892 bytes
SHA-256: a469e7aac0083eb0f96fb630d59e1342f074ee2ecc71f098b03bd59e694dd54d