Malicious PDF — malware analysis report

Static analysis result for SHA-256 82aa8587a7ccfe86…

MALICIOUS

PDF

78.3 KB Created: 2021-02-15 08:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8d9405fcc6c696efe5c509dca3e5b7fd SHA-1: 0f0241e20f1baf2014a50b6c3d723da21443f031 SHA-256: 82aa8587a7ccfe86d08aea79a2f652ed37f98b6f30d47278d6e615ea5be1e083
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure itself facilitates the attack by hosting numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/123?utm_term=the+successful+match+200+rules+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5ffb2dcdb80b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601a0f2b5a657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5ff043fb8056d.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/4551972.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/vhhigib/narararugop.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/fibjgx7/59431100240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5fd7cecc882f0.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/hajSELq/nofijivizu.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/jhhajbj/mikirazoredaxobexuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_601bcb9f302c9.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/cQZhjmq/83526168985.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/eF9jeKG/police_chase_today_nj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_600255f83081d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/hgqHIVj/xomeririfevolepudosiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447271/normal_5fddff8b2dffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5fee7eef1633c.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/julaxel/pepiterovereguzenas.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/thriller_dance_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/monibigupofimu.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/rugujavitinijalenomafog.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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 5620 bytes
SHA-256: 39251dc29961616348e1182f844f93e0463dd83a2a6eb8f8d8e5f22703e57e11
font_01_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 10600 bytes
SHA-256: ce99c804c0001653670e99d381bca11ccb8c6cd0f61c7c219960aade8df1fddc

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