Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fa0bf953e3e970…

MALICIOUS

PDF

83.6 KB Created: 2021-05-06 23:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 64e1cc389b7732b328fa02066e6a121e SHA-1: 808e9beb54a3550c80527d0397fb5794d6ae1d3b SHA-256: c8fa0bf953e3e97087da6051471dd4947b4a0311d1699819c7098257309ae59e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+set+casio+wave+ceptor+watch+time PDF link annotation
    • http://famozosivupiwij.sportsontheweb.net/vobupatunotuxisirage.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/longest_research_paper_ever_written.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_60417c24a0410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5fee1b97c931a.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_is_charging_error_1_on_roomba.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/anandabazar_patrika_bengali_newspaper_today_download.pdfIn PDF document text
    • http://perevozka.ru/dimonunafolotape36w0k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff4e0fa6a7bd.pdfIn PDF document text
    • http://matcobzor.ru/santa_muerte_rosary_near_me6pw6n.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/lifunufomudajujuxuxosorip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_606e79a800c30.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://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_d69997db260d48a3bdc3c775a9f55444.pdf?index=trueIn PDF document text
    • http://wuragumok.atwebpages.com/xilakupamisapitigejawaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf07b5d4-db87-4e9b-b12a-c88b9104cfbb/english_speaking_app_offline.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_a283a8e71485446191056d90e9427770.pdf?index=trueIn PDF document text
    • http://zotubune.myartsonline.com/adobe_audition_cc_midi_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e77b0ba-76f5-4de9-b8e1-b07cb4bdd435/91658912970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b593dab6-79d4-4204-a22f-c688c56de174/76814294821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250ed2eb-e41c-4ad8-8b58-9f097b595324/fisuwux.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_f30c4fe41f2643608e75b82ac6c0cadf.pdf?index=trueIn PDF document text
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_2e2d55258bb14a6e93de404dc61ac915.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 4936 bytes
SHA-256: af6b269a59f922ac2f61137c84071e6a397cee9167ab3247df10d697007244fb
font_01_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 11348 bytes
SHA-256: d3d866f628d6c9158bc2113e5065052482e93e4f3f009385b77cf24ad31db35e
font_02_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361