Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d55b0ea4b654d64…

MALICIOUS

PDF

66.6 KB Created: 2021-04-07 03:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6bdab7ab0cc9478ec623baaa8cdf6224 SHA-1: ee88f3dc13f77ecd44dfb2bc34fd9dcf7745d7a5 SHA-256: 6d55b0ea4b654d644ce6df4c7799575a3c6121d93ce2086e4d9c4f2f48240ebf
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 0.9998

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://fokemale.ru/award?keyword=fetal+circulation+anatomy+pdf PDF link annotation
    • https://cdn.sqhk.co/dabizogi/VhjLKLg/background_music_for_spoken_poetry.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/8910141229.pdfIn PDF document text
    • http://fishland.store/vilebemefedekulp2omi.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/manajemen_sumber_daya_manusia_global.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/gchghgQ/cover_orange_players_pack.pdfIn PDF document text
    • http://runmasten.online/nozunumuy7c8q.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/parubujusotiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivakixisataso.epizy.com/structures_or_why_things_dont_fall_down_mobi.pdfIn PDF document text
    • http://naluliwuv.epizy.com/ratupamipafapumagerof.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_33ee969d37c94e45a074650dd797a869.pdf?index=trueIn PDF document text
    • https://17d0eb04-815e-47ed-958d-2ea761acaaf9.filesusr.com/ugd/607883_5e23cc3a732a48af874e4f961ffe8818.pdf?index=trueIn PDF document text
    • http://kepawomokatuke.myartsonline.com/zimupi.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_4ec3203df3024d7982da3ee52136efd3.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_92beb0a15830401d8782827887893314.pdf?index=trueIn PDF document text
    • http://gexaforagugozen.rf.gd/elasticsearch_modify_index_template.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_ad9f466bcdf84c0289ea43c776c6e6c8.pdf?index=trueIn PDF document text
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_4b6ac8aad05f48cfb6609c39464169ce.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_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 5180 bytes
SHA-256: 18e26d4277b26e940c9dff5440051c8a7946a60288a7435e2eede12b18233c21
font_01_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10432 bytes
SHA-256: d45659bd36adb4c74461640d2625e5b918114f278991096e5c1661f2b7abd3c8

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