Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3890c75b72eec3…

MALICIOUS

PDF

80.2 KB Created: 2021-04-09 19:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5995f278b4b01ef69abee10596d8af51 SHA-1: 91313d1e8f262dd23570451b2678d4ad48507db5 SHA-256: ba3890c75b72eec3538ed1fe2fa4b2160f9ca71074f6abc47690cc04943fc740
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://gimoguvi.ru/strik?utm_term=kenmore+70+series+washer+troubleshooting+will+not+drain PDF link annotation
    • http://rolorutebu.sportsontheweb.net/what_to_name_your_guy_friend_on_snapchat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493891/normal_6007bf00b5833.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/7785003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_6032f3f9d1751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_6063b7a24f116.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/multidimensional_array_in_c_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fd98d84d60c0.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/19d829cb6891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5ff2f0773fc33.pdfIn PDF document text
    • http://naligixe.getenjoyment.net/apqp_manual_ford_filetype.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_602eb9a9aeb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_605bc400d601c.pdfIn PDF document text
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/gatopurizaxi_jeted_zamuvobimurut.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/7875486.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/saswara_veda_mantras_telugu.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/kelazi-wuged-botajivegunomi-nuwipivorav.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/71747462459.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/carols_for_choirs_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_601db464d9c8a.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/gajodesateg-jegawepibu.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/8511408.pdfIn PDF document text
    • https://mizazilat.weebly.com/uploads/1/3/4/5/134528341/8508730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_60555a5647f04.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/fuzzy_associative_memory.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipagepe.atwebpages.com/appian_training.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_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5664 bytes
SHA-256: a5d5d4b7b832b2a9921a88dd6bf3b6826af95014caa8c12775788f26b54bbdff
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 11500 bytes
SHA-256: f6bb55cc499714cba246389015a1ba81c13fe453da867e02a3bc78930f246708