Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cfb015a1d84931…

MALICIOUS

PDF

85.7 KB Created: 2021-03-24 04:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5efd43583ed60c2f41a3f936a4832478 SHA-1: 632b17bda2cba40b14f3afc88d140c173055caa7 SHA-256: 78cfb015a1d849319b97d57a78c4da38969e942a2c295d4b5fd5e8c0491ce3da
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded links, many pointing to disposable hosting and one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The primary attack vector appears to be a link farm designed to distribute malicious content.

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=my+family+and+other+animals+netflix In PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/tujiketeridug-kedibep.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/ggdijjh/87216744254.pdfIn PDF document text
    • https://nibasekugi.weebly.com/uploads/1/3/1/0/131070633/manofosokevafewedun.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/bugigavud-vikiwi.pdfIn PDF document text
    • http://tefituguj.iblogger.org/96777603858.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/0dB0E8b/39146084960.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
    • https://uploads.strikinglycdn.com/files/e83d4733-0e4f-4826-9ad4-0866ca3f2db6/dd_4e_monster_manual_2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be348097-a9c8-402c-b46e-f299157a62a4/melhores_livros_sobre_auto_ajuda.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/pcrb_workers_comp_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b980db-cb93-45b5-9136-4fa661ba7cd6/is_the_fundamentals_of_engineering_exam_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/how_to_adjust_time_on_g_shock_analog_and_digital_ga110.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/57342151280.pdfIn PDF document text
    • http://vamudijikepefos.rf.gd/lufavori.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/what_is_the_average_salary_for_a_automotive_technician.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2fcf97-cb5e-41cd-bab0-3b811291edd4/97371156191.pdfIn PDF document text
    • http://sulegezusaz.epizy.com/24358045745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a55415-285a-4f64-a240-94935b0c78a7/kingkiller_chronicles_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/celtics_schedule_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d136d00-588a-437a-93ac-26b28c775dd6/tigapazovefoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564530e5-872c-4c90-b405-6b0c8589c471/vinarumizitipefamomore.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/the_secret_language_of_birthdays_book_depository.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_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 5112 bytes
SHA-256: e85f5ca4fff32b0ba5de6906c0ddfe26daae7cc0bb51e33d60ffd6277329cc43
font_01_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10836 bytes
SHA-256: 69a0318a0ba5dc42499276440c172082a989f0310d467687abde64be133533d1
font_02_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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