Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8962f0227288e98…

MALICIOUS

PDF

77.4 KB Created: 2021-04-08 04:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a6252d88eee63162ee6f1af185cb41d4 SHA-1: ad21aa0642cada947be5d9aabdfef6e0c94bddda SHA-256: b8962f0227288e98c9106dfe2bb4ba67b63e6f8e67afd386cc72f829f13771d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure suggest an attempt to direct users to potentially malicious content or phishing sites.

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://nipisod.ru/strik?utm_term=what+is+worley+field+services PDF link annotation
    • http://xexogafuko.22web.org/cash_flow_projection_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/6gcWYig/tai_game_fighting_tiger_liberal_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/hikMTgg/gudetama_tap_mod_apk.pdfIn PDF document text
    • http://zozuwax.66ghz.com/73870101089.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/jgumjhF/smith_s_marketplace_pharmacy_logan_utah.pdfIn PDF document text
    • http://extrameets.fun/silence_of_the_lambs_never_says_hello_claricecid4s.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/existentialism_is_a_humanism_summary.pdfIn PDF document text
    • http://krokoboko3.xyz/school_management_software_phpdw5kq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugavatakavupo.rf.gd/45352440185.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_996f7cb0eb5a4fefac7c4bdde6c019d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b841589f-1c1c-4617-a3ef-320d3b97a4ba/jenegazikazajirivodup.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_3f4c9ea85806444babc3d3db4718736b.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_18c2d9f5ef7e47e692f92846de306898.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_58403032043846088739ae9d6f3ea300.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b678bbc8-a001-49ac-b5ca-6efc99ed9202/widefipijutop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071bda80-791f-4e50-8d04-1c5c58a56afc/felubusegidipoxima.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_96c7ce2cb9a24f6eacad83ae1d8f8ee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ce845f-7030-4c9e-8596-2c02af0521e6/xavubotewinixotunox.pdfIn PDF document text
    • http://kiwejepemesifo.epizy.com/carmina_burana_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f7bec7-d6c8-438f-9373-ab7a3dbb5db1/33547527375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfeb486-fe1a-442f-b974-d67512ac2dce/hp_laserjet_2100_m_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceb2a3b-ed05-4894-8d58-928740771c14/togapizepoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be347231-6877-47f6-ba10-9597a181c261/92328509864.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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 5376 bytes
SHA-256: bad19a7610672ed07d0cdcdfc7c2dc2d4e0b0b66b7070433353dcfd27c580bce
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 11192 bytes
SHA-256: d2b82aafaa7e76d7dec218beee75229f39a60412e19bdec43f2b65d55cc3a0a9