Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c16a5f704551c5…

MALICIOUS

PDF

83.5 KB Created: 2021-02-11 14:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 745f100ed036517a3021b01a56463eed SHA-1: 74ba2dad9136e83e19cb0936ad57397544f9b633 SHA-256: 93c16a5f704551c50c93f9f6ce2440b174b6206fc825634f5919fd21d536cd58
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document is designed to lead users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or redirection tool.

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://yafferge.ru/123?utm_term=birds+of+michigan+field+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_601eea90ca593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5fee73af29d92.pdfIn PDF document text
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/5821268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc8dc7d1dc95.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/7795480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_60250db798b76.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/31578d2d.pdfIn PDF document text
    • http://lirudizulizi.iblogger.org/lessons_from_the_titanic_ielts_reading_answers.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/ninasivol/83663699734.pdfIn PDF document text
    • http://wivowutone.epizy.com/free_trial_vpn.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/41703820564.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/xomupekafa.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/50067222579.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/consumer_reports_top_reliable_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/batman_dark_knight_rises_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/73607037034.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_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 5616 bytes
SHA-256: ef398be8988e48d30140e61f522ce17764456972b0575c57de2902ed7f01daf7
font_01_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 11012 bytes
SHA-256: 897fa84be17b2ecb86d824c8fdb84fbe2801d303ea4fd31de39f50336618cf35

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