Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0c8b02c578ebea…

MALICIOUS

PDF

71.8 KB Created: 2021-01-18 09:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e2bfba229a880f672a637ba7c6b112e8 SHA-1: 079f118e1efe51a36bcb5ee8978ea19613afb2d2 SHA-256: 4f0c8b02c578ebeafd19ad8f415695a8dd7ddbe64560f4b1d9fd906697e56d55
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=finding+i+am+book+pdf', are likely used to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=finding+i+am+book+pdf PDF link annotation
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/8326987.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/fuxegof.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/lutug.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/d9cd7.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/wobulemotibaru-jumanepuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_5fbcf17ca857c.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/zunin.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/8929556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f926d21e3dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_5fbc97ea2cecd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fec3e5be271b.pdfIn PDF document text
    • https://tawurinerumirun.weebly.com/uploads/1/3/4/6/134648739/najaxisojosawa_jisutipilege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafinoligu.epizy.com/jagepijebowevogupe.pdfIn PDF document text
    • http://kenugaderagof.epizy.com/anonytun_latest_apk.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/arkab_el_hantour.pdfIn PDF document text
    • http://kafopazam.epizy.com/9439778106.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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 5216 bytes
SHA-256: b2c94d70a2c9340bea8e5dc246639660f9d4631406d1f8689ecf9e7068602552
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10812 bytes
SHA-256: 93d553412ce29ffdd67c88c02bbe608f90c246ee682f5cab398a0ddc293fd1e6

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