Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42a70448a35df10…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 19:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 82bcda979e3aa26aa6da1d536a425942 SHA-1: 7b807856e13ecfdca5467a833af2196be2ce15e0 SHA-256: f42a70448a35df1025c945e12b11df6365a339b4135e221ef12bfa540506b31c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, forming a link farm. The heuristic firings indicate this is a common tactic for SEO manipulation or phishing, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded content, though heavily obfuscated, suggests a lure related to "Biostatistics question bank pdf", likely intended to drive traffic to malicious or deceptive websites.

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://xajibur.ru/award?keyword=biostatistics+question+bank+pdf PDF link annotation
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/efe3e026a9f8b3.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/tukuwepoje_winuluxu.pdfIn PDF document text
    • https://neritakewu.weebly.com/uploads/1/3/1/8/131856632/devewumef.pdfIn PDF document text
    • https://pederojelukeb.weebly.com/uploads/1/3/4/8/134859697/27eda02b50085a.pdfIn PDF document text
    • https://figabufireso.weebly.com/uploads/1/3/4/4/134435363/4028260.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/4de4b.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/6c180a73c97.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/1669514.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/fighter_diet_reviews.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/27fe891bcf5.pdfIn PDF document text
    • https://banijeweziwi.weebly.com/uploads/1/3/4/8/134873891/virow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e46b8a9-a026-47ce-9c10-45dcf7f38086/63410887447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee43c60-284f-493a-b3a0-a164c7f22f29/xoforetutosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5794660c-f5fc-4dd5-91d9-26356df2e234/warriors_don_t_cry_full_book_free.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/munugirokorevebagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f203f6-53a2-4970-9129-239613f312bf/pewulovivixakeguloleze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd8f206-3e48-4aad-980f-25acfab1f414/koxetatopakutiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e56d9a-73ff-42ea-b12b-4456c18d1da0/juegos_para_aprender_verbos_en_ingles_para_nios.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 5400 bytes
SHA-256: e6264d327626bd41ef6bd45e277fe9b99ac6a1de379b0ba1d18ab49d624a6e99
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 10868 bytes
SHA-256: f38adbf84c70b6314f3b91f232eb0cbadc4c8c066e719a725fdab2058a930b66

Open this report in the interactive analyzer, or submit your own file for analysis.