Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb41f905f9f3d02b…

MALICIOUS

PDF

79.3 KB Created: 2020-11-19 07:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb300202d05fb5805da8e94fd750a7a4 SHA-1: d63273a63bad76b8a69311bbd31b7a793014d032 SHA-256: bb41f905f9f3d02b002b5ca7ee47099a5328d775e9a5e3953fcd09df56a758df
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 0.9997

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=powerful+and+feminine+pdf+download In PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/9462329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fab1e988c362.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/9377065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5fa992f1cf35d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8e38252333b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f9ef3226e20b.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/6c4c799ea4bdf6.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://s3.amazonaws.com/gopuze/live_football_tv_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/31853125160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf79930-6264-408d-a53b-bbc359cc6c64/60911573588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e03f84e-7432-4ed0-9b75-4519238574d8/39218769262.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/57508716218.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/reflections_of_a_man_ii_the_journey_begins_with_you_free_download.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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 4904 bytes
SHA-256: 655a8346ff7cbac41fbb711b962681f2c31ae142973ae8d09cb8c55a8ebec21c
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 11020 bytes
SHA-256: 6e8c8a1cf61c0b554c454dd32e144bd67a49aab3530e6d12ba56a4cbdb76024c
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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