Malicious PDF — malware analysis report

Static analysis result for SHA-256 82145424f1471086…

MALICIOUS

PDF

71.5 KB Created: 2021-05-15 16:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2a14b34c0a8539ec8300a12901302e1b SHA-1: 2552b0092227d1b2651684d75f2a93f26eddf870 SHA-256: 82145424f147108694fc03ea07fb1c7c367b921add67f16b9f9e2a8573d5ab86
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, which is characteristic of SEO link farming or a distribution mechanism for further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The presence of numerous external URIs and the link farm heuristic strongly suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=area+perimeter+worksheets+grade+5 PDF link annotation
    • http://ramifapufebi.scienceontheweb.net/venice_biennale_2020_map.pdfIn PDF document text
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/8298495.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/weather_activities_worksheets.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/52856781720.pdfIn PDF document text
    • https://wajusozoxedaxu.weebly.com/uploads/1/3/4/2/134235608/xokomabewis.pdfIn PDF document text
    • http://fuzuwozozat.mypressonline.com/39653614317.pdfIn PDF document text
    • https://wexewuvaxodewo.weebly.com/uploads/1/3/1/4/131407465/66175f519b3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_cb2cec46345245c4bde1dff788be23dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/5540284208.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/forgetting_sarah_marshall_dracula_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41424696-4617-401a-82ce-91620afc127f/how_to_reset_netgear_powerline_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ef8d1e-c215-4842-b96d-e16bd799b297/lerakowumoxuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3339221-418d-4ea0-a266-2464f9e18397/podukolarudavekulow.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_bd527c03e4254847915df2fb27870031.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a36efb4-17a0-4f80-841f-d431e00f5a5c/graco_pack_n_play_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97c514-d82c-499c-b501-1a051264387e/25010580337.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/zabopubazovibami.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e2c392e304e74ea692262238b18ca154.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_20460b27e66d4776a3e4f64a119fa4c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4b9e24-0e63-41ff-b142-e9d30eb4a710/pokemon_video_games_online_play_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c22b36f-c929-4469-82ac-1060a45c836c/what_is_business_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef95768e-dab8-4ede-8c93-e4ec77d1301d/history_between_china_and_taiwan.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_fb64ee23e8d54d41bd321b85fac07ab4.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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 5608 bytes
SHA-256: 5b298802948e2d81d07928c8d05cdf45c16a17d62f3ffdca9b57650361583905
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10412 bytes
SHA-256: a0b765e8195e589ae5667906060911bf86744631a75fb1d4b1de159352cc7daf

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