Malicious PDF — malware analysis report

Static analysis result for SHA-256 368ed0af9f052aca…

MALICIOUS

PDF

89.2 KB Created: 2021-03-25 13:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1e4c755ce3d933933c6e9eaae9511b4 SHA-1: 1d4735f42112c97741428885e69faaebcb13883e SHA-256: 368ed0af9f052aca306e910a57db14bec65d498196e1f3d7c2d5593f745df302
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links that redirect to known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is designed to exploit users by directing them to harmful content. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=attestation+letter+format In PDF document text
    • http://kazexezawulozij.mypressonline.com/60155507858.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/79952432530.pdfIn PDF document text
    • http://nususolajegak.iblogger.org/ragesotopegunemubimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_604050bf70b27.pdfIn PDF document text
    • http://creditreportfast.info/what_does_bible_say_about_age741tf.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/lonekav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_60532ed2702c1.pdfIn PDF document text
    • http://finansi-7.online/how_to_use_homemade_projector_in_classroomh4kyj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_60244991f0cda.pdfIn PDF document text
    • http://ruregere.sportsontheweb.net/75668256901.pdfIn PDF document text
    • http://trysoda.pro/voxaworawikuxagesnkmo1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazadag.rf.gd/jabuxoja.pdfIn PDF document text
    • http://zivuneko.epizy.com/six_of_crows_characters_birthdays.pdfIn PDF document text
    • http://vagaxalelevirot.epizy.com/71538358454.pdfIn PDF document text
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_108afe7f1c6d45319be1fc99a05dc53a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/12214518417.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_cf7d412ea6134807a09a6f12a3d334e3.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_8a2e647dc4ff4bb7875a950bdd3694a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/54037462440.pdfIn PDF document text
    • http://rojumaninewevu.rf.gd/90476934031.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_dd93be3b86314e45be80928821b8bcc2.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_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 4904 bytes
SHA-256: b625c2b2de986ae09b1a40d0482b3be3a8813910f8c8a33ae22cf3c686ef84d9
font_01_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 11232 bytes
SHA-256: e1ba379d39826e4473aa7886e416e54992c3d5a961ffa045e458828e1aa59cd0

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