Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1e5c062b76c308…

MALICIOUS

PDF

91.4 KB Created: 2021-04-02 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6526af97e15cb091c8afdc5b17e99ada SHA-1: 9711eeef9c94ef74ba80d9101f43545c54bb9d3e SHA-256: ab1e5c062b76c3086adbc92bb5afa3136c65e69e97085d3ca3426ad913bd6745
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 0.9967

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
  • 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://botokaw.ru/aws?utm_term=player%2527s+handbook+d%2526d+5e+pdf+download PDF link annotation
    • http://zipoger.22web.org/ahmet_mit_krlang_l.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/gedomutatakedaramuvere.pdfIn PDF document text
    • http://vixojejuzata.iblogger.org/2000_honda_shadow_spirit_1100_specs.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/porsche_928_buyers_guide.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/nalewawefaxarufutipajiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_87108e057fd94da784414159e4cdaf4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d467843d-3614-4f51-b08d-b58bc99917da/211524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714e3d17-bc09-4d5c-9244-03e227973c81/dd_3.5_books_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1266595a-648d-4073-b1a2-d92db1f3a621/sotuvupuzotamubazof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bd8a10-44d8-48ec-9974-b4c239d30f7c/15120979002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9243d678-06e7-4392-9e8a-830cff9b506f/fibegumibuwikufigifafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a24e020-5a4c-422b-a7b9-54e8e1af5a56/dell_u3011_dvi_maximum_resolution.pdfIn PDF document text
    • http://fugewupije.rf.gd/b_com_books_free_download_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c343b5f-f3d9-46e1-852b-424553e8ded1/xadedufagakuvafokawe.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_e94c4f012ec84ccc95bbc576b692ff2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/980c900e-836e-40c6-9823-6694dbb30143/world_of_warcraft_chronicle_volume_1_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379ed377-71b0-40c0-9a6b-39c26d73bbe9/76346861189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eee0da7-2fba-4d89-ab8e-b51f8cdb833b/65006373854.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_7d68d7e76592442eb4a18bbe73aa17b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f749c5b6-011f-475a-b0b9-1e08c597c61d/41392905124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787b9acd-63a2-41ce-a316-fb4c6465682f/what_does_dry_mean_on_lg_portable_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16d6f87-f838-4d3a-86b2-b18beb756cbe/electrolux_certified_repair_near_me.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/action_plan_to_increase_sales_template.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_13d69bb2640343e9b3d844067ee98a81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb9c1b2-848d-4bdb-96d2-22795c9cf425/thermador_oven_reviews.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_7cd491eddab54c7c80a04c26033ce886.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 5256 bytes
SHA-256: cc10a2584c8c20c4e8cf83c135f4bbf0f8b0ff57dda468744e4486dbd34bf1f6
font_01_sfnt_off00013748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 11888 bytes
SHA-256: a97b7f492994ce7cfbec823164fe1ad50670a2a4349d9bc8d1f20ce78ed5c294