Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb7de6276b090a4…

MALICIOUS

PDF

68.0 KB Created: 2021-03-18 09:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e906ae62f6047f839d28f3c8ed14ad66 SHA-1: 751f5a97a2e70099b81c3d2f78c77952c9a7fe8d SHA-256: 8bb7de6276b090a4c156209aea29d5112bf7f558a8a5b95f7b3bcb83143c8eaf
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 0.9992

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://druttle.ru/123?utm_term=green+color+background+vector+free PDF link annotation
    • https://mezufimuvuleto.weebly.com/uploads/1/3/4/0/134016906/fanunojot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fef6dc504298.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/664802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_601850054bce8.pdfIn PDF document text
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/tunawenalulug.pdfIn PDF document text
    • https://xarupasate.weebly.com/uploads/1/3/6/0/136055515/votimudide-lovuz-bosovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5fedbdfce4d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6041e3c0abeb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_601107af1826b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_48b5ad44bf304025a722efdf780529df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e00362-54cc-4ae8-a16f-72febbcec26e/how_to_update_bios_asus_maximus_vii_hero.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_a4948645c3a8475ea890920a44e58c03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a51b9d-af7b-48fb-a98d-9f5b573f8772/ikea_malm_bed_frame_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0d7793-a922-42b4-bf10-224a67b98eaa/70126508664.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_52cd08b5c139482b9b77366b0d6814f8.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_fc3b64843a7a43948cbca765d1cc8c2d.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_0f3923fa8de14cdc9b676371812a4e47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/659cfbc3-99d0-4758-8a25-e7e6a49d395c/how_to_make_1_in_10000_dilution.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_8658726ca60544d499e0f72663a7ce20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14916fee-8706-4183-a69e-a38d2e9a79f6/how_do_you_inflate_a_lay_z_spa.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_402ad6459cbd4729bf4cef4c4fbb1063.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_0b416c90e48642bd8a8e7a98c10bdd03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9297db5-05d1-41ef-bc67-e6a79cff869f/ingles_sin_barreras_disney_precio.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f312fe2df8e44e76ba9dbd598f710421.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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 5308 bytes
SHA-256: 3fb094e97179d186d06af732bb97a3a9085c2e5deb7b4389a4c86d154213bb20
font_01_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 9380 bytes
SHA-256: e1a68075185260870bcd6cc2e3a14e3af23af5bee2c63c71be9371601c1c5abb