Malicious PDF — malware analysis report

Static analysis result for SHA-256 c788ea5bd14617bd…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 05:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7451f2efadaeda9938cbf7d16f881629 SHA-1: 519e47f7145b1bccf39e17192eedc6aaba76f99d SHA-256: c788ea5bd14617bd01cec8cfe6d0f0f2c39f27e4763000bbf4dc0f26cd53ef20
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://ponafet.ru/wix?keyword=golf+clash+club+stats+explained PDF link annotation
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/kosesoli.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/78a41.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/lACOjbw/edit_text_mac_free.pdfIn PDF document text
    • http://xiravudes.22web.org/16908618399.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/KBM0jeS/tekilor.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/paxiz_zagozudiza_lufap.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/ghXiiQU/35981854544.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/djjLskN/bahubali_audio_songs_please.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/fihjchi/winking_lizard_peninsula.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/6812511.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/fejenatuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_8a67e43e12a64058bca5ff2775e69617.pdf?index=trueIn PDF document text
    • http://nuxumejaxumem.epizy.com/72804303880.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_e5f37f36bb2e4ef0bad48daabf6eb62b.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a97f665d303f47a4a909eb7c5adf8a67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/191ee8ff-b725-4d69-baf8-e747bfaffc15/rovajakilamenufezuzeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f6ebd4-f07f-421e-97a9-dd89a1b07718/vumizojamumimedani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1473ee5b-13d2-4112-9e7e-4ab8b76bcd87/one_thousand_and_one_nights_summary.pdfIn PDF document text
    • http://duvefik.rf.gd/xidogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b7edd6-c615-4d9a-8f96-00bbea8dd1a3/sivapuram_tamil_mp3_songs_free_download.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_c2b74d62103a4cc49776d0a7d893481b.pdf?index=trueIn PDF document text
    • http://milusivisebu.rf.gd/vuvipewin.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_86dff19eef044775a1a832c719f33604.pdf?index=trueIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_50ca7a1ac85b41a7ac26c15a331e6eb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0868e4-c4a8-41cf-9b56-25574f8f25c2/zofusixif.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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 5388 bytes
SHA-256: e12bb947fac429e5d5d2b9520eb7def79f48b8459c6e59f9796d58583bb18544
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 11272 bytes
SHA-256: d6d1fc0152058cb85dbe9c57b19949435f573eebd0bac603cad3abaacaf5482e