Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cef3361b6b604c…

MALICIOUS

PDF

71.4 KB Created: 2021-01-06 02:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1e2639d19cf5c7eca9e975b7cabf8691 SHA-1: 704319806abf2b0b75b67021c95a0c0b098b88c0 SHA-256: b3cef3361b6b604c6353620f96208a8766c099c14b689a7def6705798887731b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be a lure, likely intended to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=the+technology+of+anodizing+aluminium+pdf In PDF document text
    • https://cdn.sqhk.co/vateviti/jiN4scH/waranorarosi.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/3FjgPgd/sound_analyzer_pc.pdfIn PDF document text
    • https://xipezote.weebly.com/uploads/1/3/4/8/134882979/fofebajimarik.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/28b25787312.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/816732d8-8f9d-4a64-99b2-95280b3b089e/33266838027.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/28577004908.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/android_master_detail_flow_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/sosexi.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/acknowledgement_of_donation_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/speak_now_1_audio_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6702c4ad-1043-44e9-aa6e-35b65a4e7257/fiwemevokuwomoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7637ead-4c01-435b-bc7b-c4c6d5c4b03d/zidela.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/wululaloni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311fa947-23c8-4bf1-8688-3ce588463c09/25_civil_war_vocabulary_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb49456-8f67-416a-8461-f0c84986f466/chinese_mystery_snail.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 5396 bytes
SHA-256: eb489f1d18e4c8433a34ca64c5922b8efd3ba6e11452c692aab01a3b3ddd2520
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 11856 bytes
SHA-256: 4a8dcd283ae6da27f8e44b5602ce5779c56c7f7cbb2196ad3d6a5ea5e4b4a581

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