Malicious PDF — malware analysis report

Static analysis result for SHA-256 b141e95511531a63…

MALICIOUS

PDF

71.1 KB Created: 2021-03-29 15:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bcda011d5ffad48b2997d1b5e9500c30 SHA-1: b4547e32ca70b13e912b6eef323c2b5b541fdfa4 SHA-256: b141e95511531a63f3fd6b0868dc3f52b256c0b347edda88503e5696641124ce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://druttle.ru/wix?keyword=worksheet+altitude+median+angle+bisector+perpendicular+bisector PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421200/normal_6014e1bf1aa30.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/tjhy3hb/80693900623.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/cijX9jj/volivivibazibebixovumon.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/jfcLlhb/accuradio_most_oldies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_602486ec3212e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fe99364d53d2.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/jCghmEU/nobozivasakuwezilavanikev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_602b414a85cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_6038297aa2de0.pdfIn PDF document text
    • http://vofidiporalives.22web.org/sliding_barn_door_bottom_guide.pdfIn PDF document text
    • http://tuzurew.iblogger.org/cch_chuyn_file_sang_jpg_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_604d04c85dbad.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojevevoxo/agdouhg/fish_raising_my_aquarium.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_81d20e2e992c46b2a49f869e40472589.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_5e581ab0cbf64585a807b8af58ac5df1.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_5b190b9770a444fbbce0556c74f2af1e.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_d3383b78c1764cbaa7661c3506409845.pdf?index=trueIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_93fd026b44aa459692c1876b62082d7c.pdf?index=trueIn PDF document text
    • https://3c59ccad-08dd-474b-8af0-a42d91f20399.filesusr.com/ugd/489ff0_36c548db17894581aaed3cc49667f3fa.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_5eea3fc89c5743aabb937802c61b0734.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_3e854a1d8eeb43dab4ea0b1ac7239179.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_79ffee9dbb1c4d6ba7562b57bf5e3f77.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_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 5704 bytes
SHA-256: 2ca60d33740852868d0397b62092028f80a4848ca8f065a6f18b37b3270826e3
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 10960 bytes
SHA-256: 002f36f8efc905d45c189563eb9e7b681796f9e96e671ca9ee0889de37c3c6ff

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