Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cf0c3ee12ccd04…

MALICIOUS

PDF

61.3 KB Created: 2021-01-01 17:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 06c4a0d14d7b77c3f87846e36ea2b993 SHA-1: 76ac0324abbec94e1df437c386296543761413bc SHA-256: d5cf0c3ee12ccd04fc43a5d77112f536cef526acbac3a542708e50ac24758552
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The heuristic firings indicate the PDF is designed as a link farm to distribute other malicious content, likely through embedded URLs. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/123?utm_term=pea+plant+crosses+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/bazopaxepifu/LQiaHjb/coin_pusher_game_win_real_money.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/8337411.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/7445179.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/jhijmib/konotufipugokija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa74c1a4-41ef-4d12-a018-06bbcd6eeef4/fekojutopasitojavav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216f8cb6-aea8-40a7-a81e-01be9b56aa51/morujumodikinotulixaridat.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/sadayo_kawakami_social_link_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd2e3be-b3f3-4efb-9a49-92e352865b75/rozafubasasodexila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55986f4-2b09-403b-8d6a-e88b2052b6eb/29133331981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8ca74a-655b-4232-8739-fade8a4f92a9/eso_outfit_change_token.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca83c761-cdc5-46c3-894f-9fc5989a724e/4055205598.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_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 5176 bytes
SHA-256: 3dfa8cab5b9efa3add80251966e54cfa1b0b136646d5ac1479a86a34045bcfab
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 9300 bytes
SHA-256: cbd133e63fc0fc1222b591caaf2feec65c11b55d8102454541836ad4ff849a25

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