Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd20c7ffa01d9992…

MALICIOUS

PDF

75.8 KB Created: 2021-03-14 20:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 93b752cac79541598f5fe341a9093e97 SHA-1: d5ecdcfadd7e90b8c4a6ad8d9c4d0300ff20fd40 SHA-256: cd20c7ffa01d99925f337fbbae41f5eeea4113da2afaa37247016e4eace25780
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a link farm, with one primary URL pointing to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the structure suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=the+last+stand+union+city+2+unblocked PDF link annotation
    • https://cdn.sqhk.co/xijodepub/TmHibih/monkey_go_happy_planet_escape_walkthrough_text.pdfIn PDF document text
    • https://nelejezubifub.weebly.com/uploads/1/3/1/4/131406077/dafipiw.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/coleman_dual_fuel_lantern_lighting_instructions.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/parental_authority_questionnaire__revised_paq-r.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/pulemar_jejidiretazu_vulamuto.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/xetorumumeman-rulajivokages-welijigegojiw.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/VggEajj/interventional_radiologist_near_me.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/882b77c2-04b2-4f1e-a6e6-63bbb7ee7bff/41687500233.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/sports_illustrated_magazine_2021.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_93ec94f1344642d18f4021472723e4aa.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_c41666dfead24535880dc4316c9e8b75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e794bf8f-74db-4acc-85d5-469c21acb438/common_core_sheets_equivalent_fractions_decimals_and_percents.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_3e827c2cb27e4a13afa34eb91f796da9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/6306600004.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/how_much_does_a_gas_furnace_cost_to_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c8ff76-988f-4fc3-b282-429d2b48fb60/jozuda.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_e8387aa83ea249be95089fc7bf8a77a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/bulk_powders_pure_whey_protein_informed_sport.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_eb5d3a9b7b0e4097adbd82daa3dd029d.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5320 bytes
SHA-256: d8022558e691977625001d50061336639a098f4fb8682228609002b6b28c2941
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 11024 bytes
SHA-256: 36e202b8fee0903d913f520222413d0585a4faf99478bc089dd766fb21ee9e9d