Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc51006ecff2af3d…

MALICIOUS

PDF

79.4 KB Created: 2020-12-29 14:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bbf008cd80a5301393538a8686e440fb SHA-1: 4cee2d6ac40d497e5ac0345586e8b816319b484f SHA-256: bc51006ecff2af3deeef3cc220d7cf9ce2074ddd3923bed83190cb3c1d461514
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple critical heuristics as a malicious PDF, specifically identifying it as a redirector link and part of a link farm. The embedded URLs point to known malicious infrastructure and a large number of other PDFs, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

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://cctraff.ru/123?utm_term=sacs+user+manual+pdf In PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/bzYoiht/download_glory_ages_samurai_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/TqtYkig/83876721266.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/ghbRiaa/45182241787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5fb338af97da1.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/2jbgdgc/shadow_the_hedgehog_wallpaper_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/cg1bgcr/xiwezazaluve.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/Tvbgcgi/56466996663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5fb015625a724.pdfIn PDF document text
    • https://pasojonili.weebly.com/uploads/1/3/4/1/134108831/zejumopupigetimuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5f97fd6f1a614.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/susopuzupure/ancient_history_in_hindi_for_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/41761094829.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/burp_ca_certificate_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/gosumilokufomoloxu.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_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 5404 bytes
SHA-256: be32297c138054d8dd340b693840b5838de4f1475379a9eb9057ecec0bcb17ea
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10940 bytes
SHA-256: 1cabfb5fdf1e9dd09e93557f2fb2e96f3a8a1b6182d8485b4786bdbd3dba117e

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