Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00956a82b34c5a9…

MALICIOUS

PDF

124.2 KB Created: 2021-06-06 07:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5e10132f854fd572612552b4856f18b SHA-1: 71484480e745acd46e1b928862fb64bc6765e03e SHA-256: c00956a82b34c5a9621491424c617d5a317e51effe2d3bb3d1a4e00aef2d3891
126 Risk Score

Malware Insights

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

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 0.9988

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=antigona+de+sofocles+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473618/normal_5fd6ac51cdb6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fd84e3c3fb10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fc8be65cf6ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fd040268737b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_603b5ef219899.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/b721e2bb-717d-420f-93c9-799898b78d94/62466876115.pdfIn PDF document text
    • http://subazim.pbworks.com/f/veg_biryani_recipe.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144655707/how_do_i_turn_my_plasma_tv_into_a_smart_tv.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144599727/wupexa.pdfIn PDF document text
    • http://sixuditar.pbworks.com/w/file/fetch/144707514/76803146213.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144625986/akallarla_dans_2_izle_-_youtube.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144426072/hadoop_the_definitive_guide_github.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/how_to_value_my_50p_coins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9f445d-2e20-4c86-a4da-353592d1499b/35581643808.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/barbie_doll_clothes_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7cd5cc-9785-4944-8ae1-f715b739c06b/descriptive_adjectives_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5163ffa6-dc59-4835-b38a-1cd404fbc2a8/43557727957.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144586131/dudolosabuwokawajid.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/f/11643196394.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/f/tekutedanizuxibi.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/41894596125.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/umrechnen_usd_euro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18c4fc8-dc1e-4d23-a2d7-8087865b4fc5/vinuroxepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9544ddd-736c-430b-ae35-e808cc1a12c2/mosozujafesufuwevixupaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a12a67d-f836-4006-aef6-6bdbff3812f4/kinemaster_diamond_mod_apk_download_free_2019.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_off000184c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C3 5216 bytes
SHA-256: 13561f5892c09a9568dc2304ec5ff30433c7a51b4b86257e5883c04c8e77f857
font_01_sfnt_off000196a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A6 14820 bytes
SHA-256: 33841a4dd850c285aeb8674f3ff3c563fe34f82959073a99f2067e9dc0e72bbf
font_02_sfnt_off0001c378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C378 18968 bytes
SHA-256: 9246adeebe2c422eeb8bed20e4ca54ec571f6aac5b22bef6631776de952271da