Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ac5f7c8561f06e…

MALICIOUS

PDF

101.7 KB Created: 2021-01-06 12:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29e5312125d06c3e951afc6b9137ce6a SHA-1: e84d44385f65c3be6615a638501288a43361e567 SHA-256: c0ac5f7c8561f06eec854199b3849164602508f3b4ef0e30ee4c756b0495b2aa
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=anvil+studio+portable
    • https://cdn-cms.f-static.net/uploads/4404121/normal_5f9908cd9c9a4.pdf
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/momir-desisitipogewul.pdf
    • https://madovokego.weebly.com/uploads/1/3/1/4/131409717/4208525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d03ca759-3f7d-4c1e-a3f4-72f9ef2af0d0/mutoxufipawufivajizurut.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/manualidades_para_nios_de_2-_4_aos.pdf
    • https://uploads.strikinglycdn.com/files/8d2baef2-a838-4bf9-975a-c9a061c291cc/cartas_de_despedida_de_amor.pdf
    • https://s3.amazonaws.com/dazutun/commercial_real_estate_for_dummies_free.pdf
    • https://s3.amazonaws.com/muxozuvalubi/gesewigud.pdf
    • https://uploads.strikinglycdn.com/files/cb2e0e53-2691-4abe-8567-76f4a1afde53/rulowogoludonotew.pdf
    • https://uploads.strikinglycdn.com/files/cb109b78-5d8c-43b4-b215-ec7f5308f99b/lebifebutofesomuri.pdf
    • https://s3.amazonaws.com/zirojopemup/calendario_completo_serie_a_19_20.pdf
    • https://uploads.strikinglycdn.com/files/a6214cd3-ec01-4f93-8266-a7653335e5a5/zawexudaketuwalalapo.pdf
    • https://uploads.strikinglycdn.com/files/0ade5712-615d-44a2-90f3-0061fc179445/wow_hunter_spec_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001131d.bin
6a7390c9e634f7f167841a75ffa617ce3f7010ba402b4c06ad0a47e5500b6a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 2856 bytes
font_01_sfnt_off00011d47.bin
a934ddea32e98346979fda7dd469703b9930156fed4cabb1469e45bbd4a74ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 5024 bytes
font_02_sfnt_off00012e53.bin
84ce6eb9c0ea120569af94400003524f440871d50e28a9e87811068b5631a02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 11976 bytes
font_03_sfnt_off00015645.bin
0da190bcdfdbca25a354366c53f808d715e6732fd2ef3e77a1781558a1378fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15645 21236 bytes
font_04_sfnt_off00017b1b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1B 4324 bytes

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