Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26e9993729ac1db…

MALICIOUS

PDF

97.7 KB Created: 2021-03-12 18:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1887ebd5ac4c0be0121ef3f37d554144 SHA-1: ad76e6310ab604155dcb6e7f6421403986dc2f1a SHA-256: d26e9993729ac1db11c22238af876c23f5bbb44cb58f8cc92f608d8dc83297b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/wix?keyword=marker+maker+mixing+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476007/normal_60157e01b8653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_6036b293c81f1.pdfIn PDF document text
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/a693cb9ea099c99.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/08cfb2b.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/158635130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fce52690d6fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369168/normal_5ff16fac1b8ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_601a254a898eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_603ff69c8c0f4.pdfIn PDF document text
    • http://tuxoseve.22web.org/schindler_s_list_sheet_music_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5fe29101f2c6e.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://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_619abc6f5f9c4bfb89d4b3a268d286a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7300d2e0-d3fe-4831-9862-48eb67fec6c0/prayers_to_prevent_death.pdfIn PDF document text
    • http://verafewema.rf.gd/diferencia_entre_equidad_e_igualdad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13084cfd-3563-4706-9b70-d4ad2a00ecf7/lurafitapeneji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6109926a-28af-4956-9e7d-f13ea4abef24/razesagumijurapabobogoje.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_6a1172e7cac84b28907c93a3493afcbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89866e95-fbfd-407d-8247-e66c06a855d0/simple_ukulele_chord_chart_printable.pdfIn PDF document text
    • http://dexedigobejo.rf.gd/ascending_aortic_aneurysm_guidelines_2018.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/belton_isd_athletic_physical_form.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_a4258a7e8d0246d4b6fe4d832d0ad4ee.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 4336 bytes
SHA-256: eb14886eff6b776ed5318e80ad97fd11ecf005f66c277dd9a7499434d4cde6d4
font_01_sfnt_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 4764 bytes
SHA-256: 723653092b545e40146baec4d607605ae5f4274a662432d6944f6babe2bb4420
font_02_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 13424 bytes
SHA-256: d91e1e4bd8626d7fcae0750a3107ea136404ea307b7b40e7d708c2cb240aaec9
font_03_sfnt_off0001541e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541E 16148 bytes
SHA-256: 94fbc0b5894aaf4b79f104114f85d2fbd9d5fbfbedff063011ca32b9d56ce0e5
font_04_sfnt_off0001692a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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