Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6eeedcbf6c777c…

MALICIOUS

PDF

116.2 KB Created: 2021-03-07 06:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f5ac616d85e0323b8b73b9c9fe365f7 SHA-1: 45df544014c03125970e03d902a9a6bcb60849ed SHA-256: 4f6eeedcbf6c777c7503489aa5f1ac6bd3665da5e5f8187f1ef22a6e5d6e21ab
156 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 of which are to PDF files, suggesting a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly indicate maliciousness, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=humayun+ahmed+all+books+pdf+file+download PDF link annotation
    • https://vamalemujuweput.weebly.com/uploads/1/3/4/6/134684866/06dc1.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/22153d.pdfIn PDF document text
    • http://welifenepural.iblogger.org/wielka_sawa_to_art_nuty.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/ibjhgfS/fusulugodujobu.pdfIn PDF document text
    • http://bijopesenof.iblogger.org/formas_de_usar_una_chalina_con_vestido.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/5056457.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/hriiagi/87019979858.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/a203fa0b8.pdfIn PDF document text
    • https://wevukizolizeki.weebly.com/uploads/1/3/1/6/131606758/gosorijuze.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/zonuje.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/zuruvemigagana-voguzigagomefo-fedez.pdfIn PDF document text
    • http://lajalura.22web.org/intermatic_light_timer_model_ej351.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/eImfijj/nezemoropudiwabugo.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://s3.amazonaws.com/nerugiraxura/adobe_reader_8_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/85750197158.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/42449212847.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/what_does_bff_stand_for.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/come_on_get_happy_sheet_music.pdfIn PDF document text
    • http://patenat.epizy.com/proform_cardio_hiit_machine.pdfIn PDF document text
    • http://dokelegusipodi.epizy.com/how_to_fix_a_royal_paper_shredder.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/laguxekamisoxifif.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/jilitovutalu.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 5348 bytes
SHA-256: 5daadb67c219d9a1dd64f1bd4bd20dc0792773ca6bdfb9acdcac440878eb5195
font_01_sfnt_off00015164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15164 13276 bytes
SHA-256: f0066bf59d861bbac75266ae70b6d7987a50e7a29bd871bcb6dfa97f917f5c3a
font_02_sfnt_off00017ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACE 10668 bytes
SHA-256: c432d8d37b12735334d3f8186cb537fe80b8ec567a63de3e69aabd4540c74673
font_03_sfnt_off00019f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4C 16164 bytes
SHA-256: b21434860209bcfa4faa45743010641f853ea3cc1b0bad42541eb31f339e130c
font_04_sfnt_off0001b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B46B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34