Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc097d0f22f3d9d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 07:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3af3096dd425d52e9208bc94c707950d SHA-1: 8b8823e20f27ecd4bce7ccac1ad8f74ff1284f83 SHA-256: 1cc097d0f22f3d9dbfa0dec443cae6f17afac58db2752c26ea8b1963bf7bcef4
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 0.9998

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://seumenha.ru/wix?keyword=lab+mole+calculations+answer+key PDF link annotation
    • https://cdn.sqhk.co/tamaladafa/MjghdBw/barcode_scanner_for_walmart_price_checker.pdfIn PDF document text
    • http://itawegan.space/human_body_organ_system_worksheet33wn4.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/jozaxabaxugesijisa.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/biogeochemistry_of_estuaries.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/miwetiw-mokiti-rafadaniguvu.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/12595a9fddf915.pdfIn PDF document text
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/2994525.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/39be2172090b5.pdfIn PDF document text
    • http://allieshouseofhope.com/genie_2024_set_limitsq30d9.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/banibilal-bamusadeje-kijapofubawav-tezebi.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/4dJjbhe/xagugasoturinogupep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_5f1b1c2304804b58bd233dd6a5bb9897.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/juvixifofatebofazadex.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_8c1df34696b445498ded7ae9b5fb9c22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/vuwoleluvatuxurigapot.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/cheppave_chirugali_movie_bgms.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_07a5dc1291264f51a7dab950e54285d9.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_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 5284 bytes
SHA-256: 90f3c4542b2ba5df92f0faba1e2c91afc11885e15ea786d7704bf3932ec3636b
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 11116 bytes
SHA-256: e40e69e0026ef4a7553c6766c05fdb181fdf2fa1febb5a5df462f9cbb88a2b0e

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