Malicious PDF — malware analysis report

Static analysis result for SHA-256 b312588aff16c0b6…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 01:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e9717c4123cce4df9e7bb0f979a0b33 SHA-1: 144d07b5d8a308640297cd139d9220d9cafbab3a SHA-256: b312588aff16c0b6d60e72d563ff99433a022f3ad77c7f320b973d7624927dcc
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, indicating it functions as a link farm. The presence of multiple PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly suggests malicious intent, likely for phishing or SEO spam. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/award?keyword=frecuencia+cardiaca+fetal+pdf PDF link annotation
    • https://nulowuze.weebly.com/uploads/1/3/4/6/134614321/8331048.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/21272530109m1w27.pdfIn PDF document text
    • https://cdn.sqhk.co/kurutuxerodi/ijieDhf/bosufasam.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/gerogu-rudimimi-gegom.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/koxajazixo.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/3jegfjb/jaferobogegatilafan.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/8072718.pdfIn PDF document text
    • https://jipowikufimur.weebly.com/uploads/1/3/5/3/135327107/9904445.pdfIn PDF document text
    • http://crysety.xyz/watijelupaobxq.pdfIn PDF document text
    • http://meetly.space/26680113581wpex3.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/9035620.pdfIn PDF document text
    • https://cdn.sqhk.co/xogatijixe/kNSgfif/attitudes_to_language_mini_ielts_answer_key.pdfIn PDF document text
    • http://feedbacrnz.space/outdoor_family_portrait_photography_ideasjm43n.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/4549817.pdfIn PDF document text
    • http://shtancircul.site/how_to_calculate_cohens_d_effect_size_spssl20fm.pdfIn PDF document text
    • http://xifizajutebov.22web.org/40549342343.pdfIn PDF document text
    • https://wazumiwu.weebly.com/uploads/1/3/6/0/136038811/c16875ff52f797.pdfIn PDF document text
    • http://itfamily.pro/601186803770gluq.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/af3eb28f2e7fe89.pdfIn PDF document text
    • https://waramexebogod.weebly.com/uploads/1/3/1/8/131856917/2194875.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/iifjhhb/download_home_design_expert_mod_apk.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
    • http://wumepudefix.rf.gd/lg_tromm_washer_oe_code_repair.pdfIn PDF document text
    • http://monufaro.epizy.com/16556579677.pdfIn PDF document text
    • http://guxudapese.epizy.com/57993391774.pdfIn PDF document text
    • http://lerofisa.epizy.com/abstract_reasoning_test_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 4696 bytes
SHA-256: 37e31fa0cb700cfe9ec67cc2b1e365477cd7dfc365e5de2bbd2919ed2bb9b3ac
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 11744 bytes
SHA-256: 560abff51fc63e20071baeec8de7e1d50c90d115265e2c549830f3e765e94c27
font_02_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3