Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db4a63f949e96f5…

MALICIOUS

PDF

70.4 KB Created: 2021-05-01 23:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13018b609744a34bac85ec114ff6daed SHA-1: dde12a56fbf0fae9078710ec66b5160dca0c1306 SHA-256: 3db4a63f949e96f574a768da32a3264f6e3b0158ef6ba7d14d42fea4d60d1178
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=delta+loop+antenna+calculator PDF link annotation
    • http://kvyovk.xyz/60287132076q07v3.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/ajfyRX2/49434206287.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/ace_questionnaire_scoring.pdfIn PDF document text
    • http://wiinorama.space/desabewinuwqserr.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/b12559ce.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • http://nashremont.site/napamogixewozelatidojuzr7c7.pdfIn PDF document text
    • https://lononefebodamu.weebly.com/uploads/1/3/2/6/132696526/9844488.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/3958407.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/5255194.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/kie9ghx/28082988486.pdfIn PDF document text
    • http://physcoo.com/362127058p04iu.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/iichjOz/russian_driving_simulator_unblocked.pdfIn PDF document text
    • https://kopigipovivon.weebly.com/uploads/1/3/1/4/131484029/dexodemufoze.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/77194476330.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/fekera-dabudamuwexi-jewimawetes-bupujejugo.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/gchibic/31825697055.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/afinal_o_que__business_intelligence.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/rotikumev-pikuw-juwofix-dinexozetukufo.pdfIn PDF document text
    • https://kudezugomolalu.weebly.com/uploads/1/3/5/3/135331411/jolanaf-jajuxixebo-vuzazusirasu-moleferujeg.pdfIn PDF document text
    • https://kokagajimixepu.weebly.com/uploads/1/3/5/3/135331661/1457380.pdfIn PDF document text
    • https://nemerode.weebly.com/uploads/1/3/0/7/130775229/424788e2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopugorib.onlinewebshop.net/navodaya_admission_form_class_6.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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 4748 bytes
SHA-256: b94f97a86fbb6744d47b2537e2b8569c261da6b093b5fca045cccc0440010de4
font_01_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 10960 bytes
SHA-256: 81f615b1fc32c40fad75212c7b4dc082f7664e539ebe3c3d7f0bdc1e42652401