Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e556fdfc563409…

MALICIOUS

PDF

98.3 KB Created: 2021-03-19 19:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3426c380590322a6c2d5123136ae6e6f SHA-1: 6c23d19d8ebf83bbe78bd8e86bca1356f72f8da7 SHA-256: b7e556fdfc5634095d769669ddc0d177f9f94b364f09b13818edfee50b05abf5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/aws?utm_term=garud+puran+in+english+pdf PDF link annotation
    • https://cdn.sqhk.co/womalakifaxa/nMiaxib/change_eye_color_drops_reviews.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/fuporetalegupumo.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/1905887.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/hg1OjfB/business_planner_printable.pdfIn PDF document text
    • http://merogerofame.66ghz.com/87929561168.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/hhdx3Ur/funny_hamster_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/buwisotubu/hcPjhgh/wwe_raw_results_cageside_live_blog.pdfIn PDF document text
    • http://movikewenatorug.iblogger.org/versement_acompte_formation_professionnelle_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/LicgdaE/6311630017.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/797804.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/fPhL4jc/dual_survival_season_1_cast.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/kerep_xotibomaxitol_nerakifukib.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/HtggOjf/55849833036.pdfIn PDF document text
    • https://nokidekuget.weebly.com/uploads/1/3/4/6/134669445/garadumon.pdfIn PDF document text
    • http://diriluma.22web.org/mebodar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_3ff5f2858eb5466fb4e675ed814261ad.pdf?index=trueIn PDF document text
    • http://poziluxolebulu.epizy.com/nelsonville_ohio_police_reports.pdfIn PDF document text
    • http://sakiwut.rf.gd/black_dog_solo_tab.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_90f9b460db19417fb5b99ae3642afffc.pdf?index=trueIn PDF document text
    • http://bexipazo.rf.gd/mowofesudewuj.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_81c5f7aebd474963af0783cebece3802.pdf?index=trueIn PDF document text
    • http://fakovivuwuwumo.epizy.com/zegudowodajawijonenawez.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_ff0b43c0190f4434b4634930291ac937.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_d627dd4f2d4d49a9bdc165a24eac0014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 5332 bytes
SHA-256: 1a03789d7471b310f0175a966122d650a9e3d70c94723efb01a09d783a9275ec
font_01_sfnt_off0001478f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478F 12632 bytes
SHA-256: 904508f64c9d5a60f11ffb4879488526e2fd1daee73d100ccf17c7f799f9e7a7
font_02_sfnt_off00016f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F95 2924 bytes
SHA-256: 9e5f248713e06a265ef5c90e9dab77b3eb2fc09a53507b21f8de290344d6b257

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