Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6df88755938ba39…

MALICIOUS

PDF

79.5 KB Created: 2021-05-10 07:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 69e7edb77496168c68dfa3eca2df3943 SHA-1: 441f6ea93e176d6961150103b1dab8332a051bf9 SHA-256: e6df88755938ba39eb72e561d5f372b10ff10131a8e124f345c6f4b8ea2c6c4e
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://jacksth.ru/strik?utm_term=before+anna+todd+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450003/normal_6046cf207d573.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/jesuke_gaferiwuxose.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/nonenusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_6016bcda25c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_603f0279dde90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5fd822bed2520.pdfIn PDF document text
    • http://sodaapp.pro/sorofukofebokazowo3bq9a.pdfIn PDF document text
    • https://vewomovo.weebly.com/uploads/1/3/1/8/131871781/pujemime-gigamagekenapof-papided-siworaxo.pdfIn PDF document text
    • http://unonatur.space/28296782196cw6h9.pdfIn PDF document text
    • http://urolog.xyz/conjunctions_worksheet_8th_gradekdb64.pdfIn PDF document text
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/xubisivutufigil_wiwuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_604ee8b742f63.pdfIn PDF document text
    • http://topmassage.net/waletamubjipn.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/nDficjd/superhero_ringtone_download.pdfIn PDF document text
    • http://idealica-italy.site/rf_online_acc_spec_ammo_guideb9gqc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_a96347a477324138a573f01d605d180a.pdf?index=trueIn PDF document text
    • http://deravamosu.rf.gd/rodojanisixewosumutiz.pdfIn PDF document text
    • http://ponowuvibux.epizy.com/33012544896.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_6c20a88d2e2249a79bdc1ccfd73044b7.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_5054b596b7e94f9aa5b7c9234a3ba894.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_49843bcfb4cc45bdadd049effda725ed.pdf?index=trueIn PDF document text
    • http://xatosizukav.epizy.com/40169217221.pdfIn PDF document text
    • http://dadojusox.epizy.com/tufoloxegamejitaruf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 4824 bytes
SHA-256: d05e27e1267d773a880dfdd14a8608a7994e5bcb7baafa7a4361836f7bebd3ce
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10876 bytes
SHA-256: 859e5d5cc8b61193eca30b7829107f9dcf16947583c55fa2e1a83c50b5dc78ba
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378