Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f92c043ca5bb6c…

MALICIOUS

PDF

74.6 KB Created: 2021-03-05 21:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5342360ac406c3ff3a67c5cbdf5a8865 SHA-1: 8a6aabc11233ea1ea0b8359591aa5a2c76957dd4 SHA-256: e0f92c043ca5bb6c86590a52a799d2a4516f2730ac43e7cd75c4eea8fb120af2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a deceptive lure, such as a fake invoice, to encourage users to click these links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/aws?utm_term=how+much+to+charge+for+business+card+design PDF link annotation
    • http://tufodudem.mypressonline.com/26070577927.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/wisilolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff2b98e51bbf.pdfIn PDF document text
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/fasijuf_jidopuluberuvab_vaxafamupo_kitujeluguje.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/21599658746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_602ad21772086.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/6547d67f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fde1b0718b20.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/9294851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_5feaff09398b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_603f8a326e1e8.pdfIn PDF document text
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/4256439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff2a735-1988-4ac3-bc55-c97fb5d0b75f/is_there_a_difference_between_dog_and_cat_flea_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838cf8cb-a0d9-4063-970c-00e81d266667/why_we_cant_wait_mlk_jr.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_c18cfb524ff14600834083d97052592a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab1d1b4-5aaa-493d-85ec-dddc9a93ad6d/nugavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb716e7-94d0-477b-aa71-830ac60b1d52/61472224859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de665b0b-d9be-4d2f-bc13-fdeeb9e99ce3/how_to_adjust_radio_flyer_4_in_1_trike.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_a4b676cb1ddf4930bb7ef3f85d8dcd92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c710f3e3-4ddd-4318-9cc4-8e6b165b7ba2/cost_accounting_a_managerial_emphasis_15th_edition_solutions_chapter_14.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_c7384475a3794b45ad34d54a20c6b1d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8049b28-4076-41dc-b8e9-e4ecbf6a1d17/how_to_cope_with_foster_child_leaving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4642c4e-212e-490b-8ea8-8e42f8d5d08d/toyota_camry_seat_covers_2014.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_74753f4357474285ac9e83620df1eeea.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_40dc3dbb2a3543aa934420077ffa1fbd.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5596 bytes
SHA-256: 86987ed00b03b67cb22786a23c3c639c9b440c228385d1dbd723c05a75fc60e3
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 10048 bytes
SHA-256: d439aa80b35da1c7f6fca36e9cf56f84d9af7ec5545b2f4e78665b0219a6f624