Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db89a02b66bbd52…

MALICIOUS

PDF

110.8 KB Created: 2020-12-14 10:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: adb53b2a02ed17bc634e332aa05d0ff1 SHA-1: a3391fd2f000476c3759209adc5c2dd2dc4f0cc9 SHA-256: 6db89a02b66bbd523612439059d7eabc98f0faeb341c07c141d560f57d055739
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://gettraff.ru/123?utm_term=kono+naka+ni+hitori+imouto+ga+iru+wiki In PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/kovajidakarisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fc15a484879b.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/489d40d5a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/buniraf.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/puwole.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/99548066721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639b776a-4050-40d4-aba2-e5217fb467f1/miponopexesut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571d4e22-2b3f-4f24-b2fa-28b4cad2300d/eddie_and_the_cruisers_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/varesebewo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/anastrozol_1_mg_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af47e02-2af3-4755-8f64-c1e27fd42e11/bankwell_new_canaan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d146a9c-a817-43fd-8a83-f1e010e7c89a/serotamowopuwam.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/73776810449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a029dae-b4ec-4727-ada3-a358e1fd368e/mewitovegatiruf.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/calorimetry_questions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 21988 bytes
SHA-256: a7371d4e47f7474134acafbe0b7e04af13cd9831147653c5e02e01bdbff786a5
font_01_sfnt_off000171f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F6 5012 bytes
SHA-256: 7cf5dfed6368153fef9d3e16e94fbf390b81a4207a9d43d84c1e16c7628c832c
font_02_sfnt_off000182e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E9 12784 bytes
SHA-256: 9e779c7ec6aca945befe78777677d31d053d9d994250bccf0923fdf18e1f6bd8

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