Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cb1bc6ae8862e8…

MALICIOUS

PDF

71.6 KB Created: 2020-11-18 07:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 710a45a6d416fb782f91a07f5d95b806 SHA-1: 4ee09807ae470f9b5b0c101ac304261ca8b658af SHA-256: 58cb1bc6ae8862e8002ff4c443e8726285ee39ff3c5d8ee5cd0b4cc4b7aa55ca
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The heuristic firings indicate a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The presence of a ClamAV detection and ML classifier flagging further supports its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=tucson+craigslist+for+sale+by+owner In PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/5dcbf3f32.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/nulovudilevoluw.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://s3.amazonaws.com/lopadivupudexa/rubelo.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/tokyo_japan_climate_and_weather.pdfIn PDF document text
    • https://s3.amazonaws.com/modowor/39394602766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acb615c-926c-43a9-88ae-01c8d8facd63/staples_mailmate_m7_shredder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/true_gentleman_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/judukoseguv.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/xilifuwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a60418-10d3-4b3d-a6f4-eefcecc3c695/98353254725.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/nopubefugazafilaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8289a765-6314-49d3-bc28-68ef499407f8/lorenzo_s_oil_video_questions_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/piano_classical_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6999e40c-fdc3-44c0-a03e-773fa50e2f2b/85809044110.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/coming_to_america_upfront_magazine_quiz_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 5212 bytes
SHA-256: 01d83d08dfac2b639b019ed79622fbeb8249191b1ca9063c083d0978ace2fdad
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 10644 bytes
SHA-256: f9486edd089fcff1d9a39fa46bd45b7c127328ee8de942ebc242241831f51521
font_02_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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