Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4500ab55cd230c3…

MALICIOUS

PDF

59.2 KB Created: 2020-11-22 01:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d0e27d6aabcea4efe64d64a3c585ced SHA-1: 9bba9848bd2088a8690b4623fea9c26ae3c99fc1 SHA-256: f4500ab55cd230c359d7389946ef4a1aa9a4e6925a8e1ed4b3ea150e96125dd2
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://gettraff.ru/123?utm_term=national+pharmacy+week+2017`. Additionally, it exhibits a PDF link farm with numerous external links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=national+pharmacy+week+2017
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fb997238cc43.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f872fb34ae38.pdf
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/guloro_magavof_jeseropumafat_xuwenewuxodasi.pdf
    • https://popakute.weebly.com/uploads/1/3/4/8/134863009/mupizudixuxojegixika.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5bd46e43-9076-4782-9822-bfe842babd77/ap_biology_population_genetics_lab_answers.pdf
    • https://uploads.strikinglycdn.com/files/bdde9a24-e8db-436c-ac9d-07a752a8ae63/sivasawogixulasiwagosurez.pdf
    • https://uploads.strikinglycdn.com/files/543c82db-07d5-48ca-99d5-4cc168d137a5/69451093764.pdf
    • https://uploads.strikinglycdn.com/files/07625f4d-740e-4347-a2cb-6f5ff3bbe8a4/78814642212.pdf
    • https://uploads.strikinglycdn.com/files/37fbea42-1826-41d0-a77f-480190abbf10/wwe_road_dogg_entrance.pdf
    • https://uploads.strikinglycdn.com/files/77f6480d-7c96-4785-aee3-303602383d2b/wvu_federal_credit_union_hours.pdf
    • https://uploads.strikinglycdn.com/files/f4f1b663-a5e3-4649-914b-838a0f1b4599/48447508980.pdf
    • https://uploads.strikinglycdn.com/files/7e369df4-1bc3-4947-aa30-07d20d1d5ab8/86544272745.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abdb.bin
709099890edd2f008979b6cc0e8fce243ff4c67a71b4db56202ef5fbb5bbe2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABDB 5628 bytes
font_01_sfnt_off0000bf00.bin
cf1b4d4001d5687d2b08c0f105145c652a5adb363850daa31312b3a9c7514fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 9792 bytes

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