Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99b99c9c4ecc152…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 23:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9e311a309c459dfd9194f85b83daaa97 SHA-1: 5e0fa5d23a3c3a94dd7b7f9e381ff10bd80ae713 SHA-256: f99b99c9c4ecc1523157bde5744444bb984d84496d2d130eb2e32d4980dac3fb
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, appears to reference smoke detectors, suggesting a lure for phishing or a scam. The ClamAV detection and ML classifier further indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=kidde+smoke+detector+beeping+every+10+minutes In PDF document text
    • https://cdn.sqhk.co/kigaratak/iaKC4B9/97104287174.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/zefovozedurufap.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ucjjT79/pibitiririfali.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/djaih5r/86875205304.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/lord_of_the_flies_summary_chapter_3-5.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/hBJR7jb/zoxenidutibumigukekamo.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/mvjhhjj/rataxora.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/anthropological_perspectives_on_technology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5ff1e6083b2c3.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/jurozabojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5ffd83b0df3bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fe73dc17d445.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/mesotodimus/free_vpn_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/99194461012.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/79859167699.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/ir10_guide_ird.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/68750972442.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/11303595569.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/financial_peace_university_member_login.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/mapa_de_riesgos_trujillo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 5680 bytes
SHA-256: 7eb050cc9062093265292bdb1ddb0bf867b12c52dc397b4e8673761d1acd5df5
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 11012 bytes
SHA-256: fd54979be7b12344433d9111def00baa3aa2f7ea708403d17e6bcfaf037ae9a5

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