Malicious PDF — malware analysis report

Static analysis result for SHA-256 1498c43113908ffa…

MALICIOUS

PDF

79.5 KB Created: 2021-01-09 16:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be21dd934c44d0853b6b1168fddb3b51 SHA-1: ece39c52e7b7781125d360f6ece315caeb231776 SHA-256: 1498c43113908ffa69aeb1a90140de2bde673598ad56b28d72ddcaca99bbbef7
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this sample as malicious. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or to download further malware.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/123?utm_term=corn+flour+recipes+bread In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415077/normal_5fa1c9e83ce6e.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/walasavuxalafebeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5faacd53a9af7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_5ff4917cd076a.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/3GrkhcK/69843974482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fad955ba0899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fa043a23b38a.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/alNgcjj/old_school_arcade_games_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_5fa18bb2818a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fe32d65e104d.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/woneketelak/forrest_gump_theme_sheet_music.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_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 5196 bytes
SHA-256: d9ac2013206b59307fb1a61ea48b2aa01d84a00ee91b918cce49828c306cff1c
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 11796 bytes
SHA-256: b67878c0b49d0b9c842031811c200921f30fe9a32b363f996358c4ae52bed52e

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