Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20f812e136ff3c8…

MALICIOUS

PDF

78.0 KB Created: 2021-03-06 04:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 553548600d2282921a7a1c1c919a9487 SHA-1: 396bd8f3fdde0e96c59365cf8dbd5e5cad7fa1b0 SHA-256: c20f812e136ff3c89764ea679694618ff0dfa992234ed652f063e1308b9010d7
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL observed is 'https://nipisod.ru/award?keyword=ingenuity+boutique+collection+smartsize+gliding+swing+%2526+rocker+bella+teddy', which is likely used for phishing or to distribute further malware. No scripts were extracted, but the PDF structure and link farm suggest a phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/award?keyword=ingenuity+boutique+collection+smartsize+gliding+swing+%2526+rocker+bella+teddy PDF link annotation
    • http://wonitudigugejut.iblogger.org/hoover_dual_power_max_pet_carpet_cleaner_fh51001_manual.pdfIn PDF document text
    • http://rafavutatejo.iblogger.org/trig_functions_isosceles_triangles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_6926b4ecda0c43e7b21ba781c3812646.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_964008efdb7547edbc5bb5ce29f8fb68.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_b8969519df3a4086ab2edc7ec8357324.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogedozara/eft_emotional_freedom_technique.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_11336537430849b68103b0a146e82dc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/utorrent_free_windows_8_64_bit.pdfIn PDF document text
    • http://nutogexutal.rf.gd/74764580590.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/thickness_of_galvanized_sheet_metal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d34f43-2b6a-429d-95da-fed1f304da38/54230041872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678f515f-caf7-43b1-a28c-7a78c4f1c74e/70480271424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0b1f6e-7755-4c2b-b390-0703ed04e6fa/how_to_connect_hose_to_ryobi_pressure_washer.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_947f26b52bda446d922fc008a0456289.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/why_isnt_my_dell_pen_working.pdfIn PDF document text
    • http://lobusiwogix.rf.gd/la_divina_comedia_el_paraiso_resumen_corto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40297e85-897e-479e-a062-663ad2ae21c1/stokes_how_to_do_media_and_cultural_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36591bc-860c-48cd-863a-f37bdd2d820e/4210416698.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/victorville_case_information_online.pdfIn PDF document text
    • http://variwud.rf.gd/vakodepofuwobamamikad.pdfIn 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_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 5704 bytes
SHA-256: c30430e1337505fcb502fb654e7a70a4b3b2cb28c2a10d8460a6f8b531af47cf
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 11188 bytes
SHA-256: 2fd83174275f929756190a1bcddb0f3d1215467506e8130b5f50a8e03938c4e5

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