Malicious PDF — malware analysis report

Static analysis result for SHA-256 102271112f26210d…

MALICIOUS

PDF

83.7 KB Created: 2021-06-05 17:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7cdeec75e6b66913e8c79da61029cba6 SHA-1: 71f7385d64419b2c8b8d2ccf2ddde57c68dffebe SHA-256: 102271112f26210d940117d32ff33eb6a90d0b14ad2fc8e092a866a51a7f449f
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 0.9991

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://ketchas.ru/pbw?utm_term=netiquette+rules+for+students+ppt PDF link annotation
    • https://fetedujas.weebly.com/uploads/1/3/0/7/130776810/xarawefowesakowetilu.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/5160299.pdfIn PDF document text
    • https://sedaduvu.weebly.com/uploads/1/3/4/5/134598683/6487990.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/zibisumajaraxe.pdfIn PDF document text
    • https://mifetajuluvonu.weebly.com/uploads/1/3/4/6/134610270/9442834.pdfIn PDF document text
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/156ef1.pdfIn PDF document text
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/4587eeb3bfee03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7331e847-421e-40fb-a732-477c61e533bb/brawl_stars_hack_apk_16._1767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646dab43-cf20-4eda-91c9-f325939e00bb/78787575080.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144480816/zetivojawusinuxub.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/77301302483.pdfIn PDF document text
    • http://lakiluxodev.pbworks.com/f/finally_ants_mod_apk_2.43.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144414156/names_for_pubg_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc573a9-62d7-41b4-ae0f-87d427f3b9a9/problemas_de_salud_en_mexico_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d73e9e-f7ef-425b-91f4-717af16ee9a7/how_to_take_care_of_a_flemish_giant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdeb7032-214b-4080-96b2-ec2c428a8d97/rifixikeluwesefawoxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40417925-3b94-4970-a7c6-1e66836a8129/10000_reasons_matt_redman_lyrics_nederlands.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/86457623542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca4c6ca-9e41-4f79-896e-2d9d12107f63/how_to_mend_broken_brass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead4b65a-5cb8-45ad-8169-6ad7eab9c6bb/what_genre_has_the_most_subgenres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8040f0-c0df-47be-8e9f-65093a21036d/mirenidenifusopuxoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b9449a-06e4-4168-9f1f-63a34b6ccbf4/ver_nuevo_rico_nuevo_pobre_captulos_completos_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6892f82-9b33-4aad-b939-7496df09acbe/41880118637.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 4920 bytes
SHA-256: 75af3185e33c6766158a75f8f0b88f7601ac14be0af3f5b1ad182ae20dacb009
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 11500 bytes
SHA-256: fe4fc463113dc0c73906b17f51bf39cfa56cf43bb8212f93e08d43d731810225
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939