Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3edca3f3bf1e74e…

MALICIOUS

PDF

109.0 KB Created: 2021-02-17 11:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5c5539a6850a159ded56007c57830b80 SHA-1: cde052b30e591c436ee1ae2620f092f090aa55d8 SHA-256: f3edca3f3bf1e74e63b1b6867ae0e016553a30f545cbe79768f73b55aee9748e
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=945+motherboard+audio+driver+download+for+windows+7 In PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/lumedoleno.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/vavubave-seruvovu.pdfIn PDF document text
    • http://mojamozegibobav.22web.org/android_ios_naruto_online_mobile.pdfIn PDF document text
    • http://rejasepilibuxep.iblogger.org/budifiluzugejove.pdfIn PDF document text
    • http://pearhaidhr.fun/ruwek9ymnk.pdfIn PDF document text
    • http://mini-cam2.club/qu_se_siente_cuando_se_baja_el_azcarhtaq3.pdfIn PDF document text
    • http://gayerkan.com/988517682220sid3.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/ccae54f9.pdfIn PDF document text
    • http://doordash.fun/vojitijb9z7v.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/deputejun_lonufudedo_fixazupuw_xuxonizuvonen.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/ac91eb903e88fe4.pdfIn PDF document text
    • http://detonic-ro.website/42979137255bi507.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/1d2519332fb84b.pdfIn PDF document text
    • http://bopodimo.iblogger.org/bissell_little_green_proheat_pet_replacement_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/polexebuj/axial_wraith_spawn_manual.pdfIn PDF document text
    • http://pidezesu.rf.gd/20575652054.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4D 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off000159d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D0 5672 bytes
SHA-256: 13c2c0a54080cf7937a953c0c8cdc6f07e3567a3536803536de1dea30d2c1665
font_02_sfnt_off00016d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0F 12484 bytes
SHA-256: 0a3b88bf83339b10b8cf77fd5eff99156ad9e6faa1684d1e4c14d50d40d4c181
font_03_sfnt_off000197af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197AF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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