Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2007a8f842ddcc…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 09:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 96ce3727272947841371c6046b0413f0 SHA-1: 99ad4bbdcc0c8b25226ebf7f22e91669edae5901 SHA-256: cf2007a8f842ddccd3f200b8ef4269f134e341663b304ae550bbf08cc4452022
214 Risk Score

Malware Insights

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

The PDF contains critical heuristic firings indicating it links to malicious redirector infrastructure and is part of a link farm. The ML classifier and ClamAV also flagged it as malicious. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=cop+watchers+bet In PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/8cc7257204aa.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/4c2cb17da89382.pdfIn PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/6644068.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/ferori-voxebupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazofi/film_lorenzo_oil_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2115b25d-ceb5-48d3-92fe-460cf5f680f2/died_in_house_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/yo_kai_watch_3_qr_codes_for_deva_tags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a09173d-8756-4c4d-9655-18d52d41aed2/werusajunagogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1223d4-b429-47f4-b147-ce2d4b1024ae/teologia_do_antigo_testamento_kaiser.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/oster_12_speed_blender_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84bf9a8f-741b-4c2c-bcc0-c0ca82bde87b/lidadilurapikufotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7334b0a6-34f8-46b8-9ad4-ed14b75a88d4/chicken_fricassee_recipe_cajun.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/what_are_your_best_qualities_interview_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 5124 bytes
SHA-256: fcd3c49e099691140dac01484af82ee8578b409bc9c13fb6a42d52cac047bdfc
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 10292 bytes
SHA-256: 306f614de3f0d77efec5146cd8785990be5a1c189f3d03147a0aabdaeba10d33

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