Malicious PDF — malware analysis report

Static analysis result for SHA-256 5025461a186fdc49…

MALICIOUS

PDF

79.9 KB Created: 2021-01-20 15:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bccd3fb5c114bbe47036bfa5cd2727a7 SHA-1: 9279e98d96d50fbad5eecfdf875cae6ba837d251 SHA-256: 5025461a186fdc495b9225ad7e9412afa3777dae36e97152f97bf787d95ae951
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to external sites. The presence of links to known malicious redirector infrastructure and disposable hosting indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=cheetah+life+cycle In PDF document text
    • https://cdn.sqhk.co/salenasova/dibjeij/25389142396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f873f735aad3.pdfIn PDF document text
    • https://site-1248241.mozfiles.com/files/1248241/34123263235.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/TjhiapR/80372382377.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/tjajfhe/owly_twitter_digest.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/733538d86.pdfIn PDF document text
    • https://zigapugulila.weebly.com/uploads/1/3/0/7/130776078/8040196.pdfIn PDF document text
    • https://xabesokexiba.weebly.com/uploads/1/3/4/3/134327988/bolumatixulazov.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/muvuratuvazakono.pdfIn PDF document text
    • https://site-1168348.mozfiles.com/files/1168348/pamurovibedadumajiluvujox.pdfIn PDF document text
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/xifewalolabim-volak-ludoxizazeku.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/4643696.pdfIn PDF document text
    • https://site-1173313.mozfiles.com/files/1173313/bass_pro_shops_pyramid_size.pdfIn PDF document text
    • https://migixemigesafo.weebly.com/uploads/1/3/1/3/131381985/buvurivutibebozu.pdfIn PDF document text
    • https://site-1206121.mozfiles.com/files/1206121/46470648977.pdfIn PDF document text
    • https://rinizazekuke.weebly.com/uploads/1/3/4/0/134012784/lirawuxaxe.pdfIn PDF document text
    • https://site-1178709.mozfiles.com/files/1178709/najog.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/gghgejg/spelling_age_test_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 4700 bytes
SHA-256: 964e3fae006989d83dd72e01a80ea6c5bfcaf79966dc8ce99ae11024903d662d
font_01_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 10240 bytes
SHA-256: 6a7c67a8f0d25749a22b5eecb1c1fe0c7e5466b5b9b5639f77bf3112b7d5fab1

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