Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbff601cdb97df11…

MALICIOUS

PDF

85.4 KB Created: 2021-04-08 23:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cf17da2effba1a54917e13d61d7adef2 SHA-1: 639ca158e7be97b426030475270b1ade6fcee102 SHA-256: bbff601cdb97df111f47141179d4852631b21b34ea01285dd016c1b84355775b
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by multiple heuristics and a machine learning model, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious content. The document body, though heavily obfuscated, contains a search query related to carpet cleaners, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+is+the+best+bissell+portable+carpet+cleaner PDF link annotation
    • https://cdn.sqhk.co/jeforije/hgtijpk/influencer_marketing_meaning.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/43839940261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_601cb68668a48.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/jisatewedojulepug.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/hnNEhaB/82230281720.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/capsular_pattern_of_all_joints.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601f61ea61ce4.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/23772436621.pdfIn PDF document text
    • https://cdn.sqhk.co/riwewazisara/hkxaiif/best_capture_the_flag_pc_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_5fd92f38ac341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_6064308c9fcd1.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/cub_cadet_lt1045_steering_parts_diagram.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/fistula_preaurikular_adalah.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/xuras.pdfIn PDF document text
    • http://lixidepobejoji.mypressonline.com/sozekifeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_9b4f3445cd2542938a0d7e4e79806aa9.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_4d1f633774a74666bbb94b1c784b4b38.pdf?index=trueIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_4fd7c52651264fbab631ccd0b397007c.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_9532ca162bd346ca87916acf12591567.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_999e54dde63c460b8d398fc19471e6a8.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_5456c52530ec4c9bbc233f5c73582516.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_cd71e83e9dae41209a95b1981f4fd696.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_13d028280ea3452c8a8ce06d7587c1c7.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_1355b8aa879d4fd6bd5814b30986bae4.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_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 5176 bytes
SHA-256: f1c056d9c3b29809044473c16946a97f57db6ef1c4821a3b889d65eab8f5dd1c
font_01_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 11068 bytes
SHA-256: 279464cbbdb3336b2a9c072ee3d5f5888bfedeeb06dd0f953fe53716c37cf9ca

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