Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae06b36f6912f7e3…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 16:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33a52fd106b091ceab3ba1a744440ed SHA-1: bea3b22c113ee604fd95de4a9b0a53304ea60142 SHA-256: ae06b36f6912f7e314a5e0ec3a895400a4a26c6b008d4eabddb6bf4a3666e466
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The embedded URL 'https://jacksth.ru/wix?keyword=chain+analysis+dbt+example' suggests a lure to a site that may host malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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/wix?keyword=chain+analysis+dbt+example
    • https://cdn-cms.f-static.net/uploads/4470224/normal_603f5a435d31a.pdf
    • http://duwinijuj.mypressonline.com/kivobugilukisakiw.pdf
    • https://senakubedezozi.weebly.com/uploads/1/3/1/6/131606366/f6655baf4f96fb6.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fd3508071865.pdf
    • https://terokusaf.weebly.com/uploads/1/3/5/3/135347070/difif_mumone_kogikopin_sotixepowusiri.pdf
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/pajidas-fuzulajepe.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_601469b10c792.pdf
    • https://gunulavosaki.weebly.com/uploads/1/3/4/3/134374607/f12243d.pdf
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/db5a527.pdf
    • http://mejumeroxara.mywebcommunity.org/technology_in_the_future.pdf
    • http://pexarinolal.mypressonline.com/vixozerijopuje.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/3a9fa4.pdf
    • https://bejelopaze.weebly.com/uploads/1/3/2/6/132682113/logodozorexejulipalo.pdf
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/xelusi-modopozom-gufen-nikeba.pdf
    • https://cdn-cms.f-static.net/uploads/4419211/normal_605500ebe6be2.pdf
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/7387701.pdf
    • http://vimobewawulipiz.mypressonline.com/how_to_shut_off_ice_maker_on_frigidaire_gallery.pdf
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60202e98f0d15.pdf
    • http://keniworu.mywebcommunity.org/kuminavekisuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://safedoguno.onlinewebshop.net/40526066099.pdf
    • http://seroritubofa.atwebpages.com/biological_science_7th_edition_freeman.pdf
    • https://uploads.strikinglycdn.com/files/0b853081-a8ed-48e2-a6e5-2ea2ebe2a3ce/77381023836.pdf
    • http://damowepoko.myartsonline.com/9687287023.pdf
    • http://kepofif.onlinewebshop.net/suzuki_violin_book_6_song_2.pdf
    • https://uploads.strikinglycdn.com/files/e6f00924-e1ab-4f5a-9fb1-284a90f67a43/how_to_embed_poll_everywhere_into_powerpoint.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b5.bin
40e5cd1893e0eaf6464a97b0964505a83d1c4205b906ebe277c0fe57ca2c5a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 5316 bytes
font_01_sfnt_off000107a7.bin
6240adb4bdf0be4228e66fc6bc1b4958c34c4e1866329fa04c2a12b5c6120760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10812 bytes

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