Malicious PDF — malware analysis report

Static analysis result for SHA-256 125b3e24501147e3…

MALICIOUS

PDF

73.6 KB Created: 2021-02-20 15:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66adcbe201bca5834151eeb496f13cb8 SHA-1: f7751d68b85471a250789b6958fcac58869e1c93 SHA-256: 125b3e24501147e32ac95baa96a20b438bab62f5de0e5c5252cd4ce7e40a121f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a direct link to known malicious redirector infrastructure. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

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=honesty+given+the+pedagogy+of+the+oppressed+by+paulo+freire In PDF document text
    • https://witiwalaligizis.weebly.com/uploads/1/3/1/6/131607575/sefizurezeme-babunelikisin-jaral-vatuvi.pdfIn PDF document text
    • http://uaregroup.com/935006493604oas0.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/5096315136gms7o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5fe7784f33608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_6009f2e9d25ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fc716395ece2.pdfIn PDF document text
    • http://mbfsopg.com/393536525934atik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fcdddbdc8dc7.pdfIn PDF document text
    • http://vitalia-transports.com/52783653216rj9yy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fedab91aae58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5ffab7b0e3758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_5ff6b78b39551.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/pubopelej/abba_happy_new_year_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/badbadnotgood_iv_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/minecraft_launcher_free_cracked_1._8.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/jasonunivupeke.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/good_morning_photo_love.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/88913772668.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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 5568 bytes
SHA-256: 4ef7a31856dc67b7fecbb0154b4ffa6565faeceb7b6772ccf163ba2419cf40f5
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10276 bytes
SHA-256: 7500d7d7b8a5b1faf576a2bc7e6850dc8af1e39b1a647fd8f5942c860f865e95

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