Malicious PDF — malware analysis report

Static analysis result for SHA-256 481db2e810c45d24…

MALICIOUS

PDF

69.2 KB Created: 2021-03-09 06:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b1e806216a509454ee88ac36e30325de SHA-1: 9fc0873434b0daa4674fe2ba1aaf52b3528b7fe8 SHA-256: 481db2e810c45d24ccba65a0320ee2afd984f71067ad0e2c817b8529ee157e7f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=chemistry+chapter+8+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499002/normal_5fdc1145784e3.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/paketikiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60372845dc352.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/69496610728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_603962312ae20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_6023da821f140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f782ca79f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc86547e4298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevowamudad.epizy.com/kokux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b6cf25-ca24-4914-8975-363350e8b024/nagivoxazaganuk.pdfIn PDF document text
    • http://vamivesuger.epizy.com/piradiguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c70e8ed-d227-426d-85d7-2c733e93cdb2/personajes_de_luces_de_bohemia_por_escenas.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/kopujomapoza.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/us_army_41st_field_artillery_brigade.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/10402460457.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/dituw.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/zefapumofutupabujinisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15722894-9b20-4089-bbc9-ff5d76b0ffd6/dozawubupubi.pdfIn PDF document text
    • http://binasizula.rf.gd/51538887314.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/national_geographic_abu_dhabi_live_android.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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 5432 bytes
SHA-256: 3f2d336a15755bfff9c4c47ef5640f69f92429efbe14a6635f057029ca01a97d
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10168 bytes
SHA-256: 7f2ab976463e3e4a73326efbaee6f537349239b2863ef88dacaaa848abcbcb9b

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