Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f48c30d280834de…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 00:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3e07f247019645be73eb11d48913a053 SHA-1: e8408e104c8b91dce7ec4deb12f74427f70901ac SHA-256: 9f48c30d280834def47cd4915eff5d623563e99df1bda2777bc34e5e5f5bb056
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 0.9997

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://nipisod.ru/wix?keyword=partial+income+statement+for+manufacturing+company PDF link annotation
    • http://vizezokope.iblogger.org/habitats_worksheet_year_4.pdfIn PDF document text
    • http://mnclassis.org/2628307712619nwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/1gcZyhj/xenarukadalafiwa.pdfIn PDF document text
    • http://pomemaxevisuma.iblogger.org/how_to_learn_a_programming_language_on_your_own.pdfIn PDF document text
    • http://juwatorota.22web.org/coreldraw_x7_portable_free_raw._com.pdfIn PDF document text
    • http://roskycnmx.com/make_friends_tinder361cf.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/h1KhL6r/funny_memes_2020_clean_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/xasujuteguk/hgMEmSu/1065295535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/39521ab7-7e63-455a-a985-096c67c397b7/logo_design_ideas_for_business_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70195b40-4e0f-4891-aedc-cafefe8e1da2/is_honey_badger_dangerous_to_humans.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_70cc75e857284720a8a03fb1ae460e87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/136dfb23-807f-450a-8d72-3ad50bd27149/clasificacion_de_los_numeros_decimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c8fb7c-1374-4fa8-be16-af93327b2cdc/orgrimmar_mount_trainer_bfa.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_f14af410ac8d4d01a2c542e7848cd176.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38574d47-3c5e-4dfd-ad21-67c39cf03ec0/lajamotujikisekiwokeg.pdfIn PDF document text
    • http://zojimako.rf.gd/nc_drivers_license_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfbd46e9-c5fb-4056-98a7-024d95855698/93091144811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7566fcc6-cebd-4d13-8b58-afbb215d3e89/fadowajepubakakelin.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_0499dd52c475423b85b7ce0652e2d9db.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_580c70ab0f504940ac71d6b3e944e879.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 5320 bytes
SHA-256: 6ddd10c05a914577176dd16bcc7f5b9b10f1598cc34a8773a2e9ecdefbf1fa3b
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10636 bytes
SHA-256: 8f0ad09b5c261cfb029d074e41d7ecbb4aea5d3ba967b0fa32f1a002e5568d1d
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c