Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cde9371ca1b75c…

MALICIOUS

PDF

58.4 KB Created: 2021-06-01 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88ec429d0360f3e4be591c73027ba60f SHA-1: 9899706d2727c5594cc9f96420ebe511863c72ff SHA-256: 59cde9371ca1b75c1f08d2725d789aeee6a61f8dffac5c1ecd815aec742f60a2
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7237

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://huntic.ru/pbw?utm_term=trig+identities+puzzle+worksheet
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/banaterefuto.pdf
    • https://sepuzemafunud.weebly.com/uploads/1/3/4/5/134584668/basapuzabowusovasuka.pdf
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5ff4f5892868b.pdf
    • https://kaxizaro.weebly.com/uploads/1/3/5/3/135349404/wokijijiluvidi.pdf
    • https://topurikilelugon.weebly.com/uploads/1/3/4/6/134611003/jinus_fuwaj_weforidubof_sabek.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/2437508.pdf
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/suvodu-laroporezokawo-jetuw.pdf
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/xaxukazogud.pdf
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/guxip.pdf
    • https://cdn-cms.f-static.net/uploads/4411252/normal_602bf91cce405.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/6004367.pdf
    • https://xajijalati.weebly.com/uploads/1/3/3/9/133997138/zijegazupetar.pdf
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/2164645.pdf
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/671008.pdf
    • https://jezogoxus.weebly.com/uploads/1/3/4/4/134402646/217987.pdf
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/xumetelafibeker.pdf
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/nijunu.pdf
    • https://cdn-cms.f-static.net/uploads/4453100/normal_603f2aa1260b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuvebag.pbworks.com/f/eysenck_personality_inventory_epi.pdf
    • http://zufumegi.pbworks.com/f/what_are_the_duties_and_responsibilities_of_a_finance_officer.pdf
    • http://ziludezubeju.pbworks.com/f/how_often_do_you_clean_cpap_with_soclean.pdf
    • http://dekokos.pbworks.com/w/file/fetch/144416364/pawoninokugawujog.pdf
    • http://sijomirurefi.pbworks.com/f/62191476885.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d745.bin
d2fffe6e6558f5fd448494c29572fcf700631be63e85d337e5af517e5cb54aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 5168 bytes

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