Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d9c4487da5880a…

MALICIOUS

PDF

89.7 KB Created: 2021-03-19 17:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ee8f879c9d5b41f00a00c34d7ad2443 SHA-1: ebf99994918a4073396644877969cbf7bd08abb5 SHA-256: a7d9c4487da5880a176c75a5e716330e7a82911e45f5d4bce59343ccb299814b
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is https://crophysi.ru/strik?utm_term=arris+tg862g+modem+speed, which is flagged as a malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the links are the primary vector for malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://crophysi.ru/strik?utm_term=arris+tg862g+modem+speed In PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/6255811.pdfIn PDF document text
    • http://talejeripubala.iblogger.org/adjectif_et_pronom_possessif.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/kupis.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/1b39183ba6db2.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/5799595.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/eibbojd/bevunatazibo.pdfIn PDF document text
    • https://cdn.sqhk.co/kixepijap/ONiiGje/new_york_times_sunday_magazine_submission_guidelines.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/7850368.pdfIn PDF document text
    • http://miruzoguke.iblogger.org/ak_driver_license_record_california.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/tipite.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/vofatajumix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peporil.rf.gd/xibazukiwitagerewolowu.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_64d65819745c4658b749fb132fdb703e.pdf?index=trueIn PDF document text
    • http://wuvasof.epizy.com/51527266933.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_09e12235a8054a7f906ecf835452d650.pdf?index=trueIn PDF document text
    • http://zilazop.rf.gd/bsria_bg6_2020.pdfIn PDF document text
    • http://jatuxijor.epizy.com/prepositions_of_place_worksheet_busy_teacher.pdfIn PDF document text
    • http://miwafugupek.epizy.com/61341825777.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_d052fdce7fb14904ac39cc46113e4cda.pdf?index=trueIn 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_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 5504 bytes
SHA-256: a93775ae09c6f1bc31a5f533d775a88a737ec00a36cd4b429946fa026094dbf0
font_01_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 11384 bytes
SHA-256: 9c574a4c2f01c5ddcbb0e6d5ecd8e81d5068b86e776b97202cf1e61a48f5b066

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