Malicious PDF — malware analysis report

Static analysis result for SHA-256 632932d9d51653d0…

MALICIOUS

PDF

85.8 KB Created: 2021-03-17 00:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 062e6940e0e281c76e15cbbee7668bc7 SHA-1: 1a012fc44612c310b7426b4b693601d048ac3e6c SHA-256: 632932d9d51653d0811ee0f6b4fa480008043009593f2b9f25e06302429324a9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=recommendation+letter+pdf+format PDF link annotation
    • http://bewewafip.scienceontheweb.net/66141498389.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://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_bfa95ae8caf24adb8bf573f5d41a0117.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/741b468a-8cdf-4974-a05c-39f296739c4c/smr_codes_usmc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dbda31-1c21-4ad4-a0a9-86344fb0dd78/st_thomas_centre_nursery_school_birmingham.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_379448d0542e42dfb9846dff26999b47.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_db755c798f2649fe977b19aff2aa200b.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_454b4a6f062545abac6d927049bf3004.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b1addc-6a62-439c-86c7-0f227ae668d2/bisuxajilalatek.pdfIn PDF document text
    • http://povusesa.rf.gd/wuzimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52293777-8a1e-44f3-a14f-e8eca89e1347/honda_eu2000i_eco_throttle_troubleshooting.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_13a5cf705596498cb9c8cd7236ab1b75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d00d82b-a69f-48d0-8751-24df8380362a/apush_settling_the_northern_colonies.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/geometrical_optics_exercises.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_80a6fca4cff0448ba514cafa288a7be5.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_3a105e4f050b432789c594474ee27ebc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c09838a-0fd2-41b5-909c-ac704b25a3c4/rufitopeturedoguzesezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06688555-c2b7-4baf-870c-9a8bc286a771/why_is_the_apocrypha_not_included_in_the_bible.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/79129027004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f11f03-3b05-4601-bbb7-62cc8b96ffd3/86999502959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6302ba-db62-4e6b-87ff-c88c5b7cd3f6/how_to_program_comcast_remote_to_control_volume.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_6af2cfe76b084ee8a5b61ee1a971d0a1.pdf?index=trueIn PDF document text
    • http://mivowejow.rf.gd/digraph_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_19e55b13006441a488023e98d748c98b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 4920 bytes
SHA-256: 968c01192eba83e4dec4e3f9e9e976b09eed8ee50b3dc0a06e722f2522b8e319
font_01_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 10840 bytes
SHA-256: 34961cd9640f749a8e320510f26fb043098b18eb44f0fc0570d305ca9855177f
font_02_sfnt_off00013b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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