Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1741a70676a7c1…

MALICIOUS

PDF

76.0 KB Created: 2021-04-05 06:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ffa03a5d9b74853450108dfccb535dbb SHA-1: b3303d519563a7defe51479de12cc87fd218c867 SHA-256: 6f1741a70676a7c113e34abb23ba84654e45344870ec36500aaf5266d588e618
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to remote jobs. The presence of external URIs and the ML classifier output strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://lozipotod.ru/strik?utm_term=what+is+the+best+remote+jobs PDF link annotation
    • http://bufezipuduxev.mywebcommunity.org/20750162762.pdfIn PDF document text
    • http://soul-felt.com/313207963142pjoi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_606958b9bd8ac.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/19180539476.pdfIn PDF document text
    • http://it50disconto.pro/159621097438oaln.pdfIn PDF document text
    • http://mjawebdesign.net/vabubudof3ns84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fe3697144739.pdfIn PDF document text
    • https://posijakafit.weebly.com/uploads/1/3/5/3/135320461/1306351.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/89383133220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380675/normal_5fe4d51752988.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/online_rent_agreement_format.pdfIn PDF document text
    • http://dimax-matrasy.ru/how_do_i_find_my_sky_remote_code3b0or.pdfIn PDF document text
    • http://braco.ru/fuwageninemodijax8dsw5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fdfd59243bb9.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/4139102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_6054606bc7abe.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/zeramibazikako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_dd962b9dd0b347b3bb86bb0dccc3a853.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_82a9007b45934c158f3dec331dabbf28.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/nenejopetizobiwolatigipo.pdfIn PDF document text
    • https://23c735dd-cbab-4b34-b334-20576347ef0e.filesusr.com/ugd/237bf7_13f84e098fa94451b1f4158f00645bf9.pdf?index=trueIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_2542acb68259494b8045e29acc879979.pdf?index=trueIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_9ef5c3803a0e421cb30ea7239e85174c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d08ecfd-3ca5-4351-b457-e45709a2eea9/what_are_the_roles_of_gender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5667a529-3f0c-4521-9bd2-8174d6d260d3/10801878251.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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 5120 bytes
SHA-256: 1e4bd5963529ed6081b7fbc3e4c1ddc9aa68c5d532934a6ed430f3ffa198ef1c
font_01_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 11144 bytes
SHA-256: 78517f944472cd0577a997fca4e2b08c95ad4046b3cdf12fc5500676e5ef019d