Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82ce0aff4faa2c1…

MALICIOUS

PDF

69.2 KB Created: 2021-06-07 21:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b653bd9003e5c72d948772d1027ed353 SHA-1: 254df831c23cebc9f594d29615edabdb3b4a39ab SHA-256: b82ce0aff4faa2c1570ecc83c94d2ee21b80deb1d8552e7e12c1b4cfa96f6a88
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://smidgel.ru/pbw?utm_term=what+size+wire+for+electric+fencing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ffa119cf320b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4415292/normal_60b493621fb86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_600f5dbcae151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_602c2c0e1dc86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_600f74a0aa84b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5fdd438b0fd11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_601eaa2815b80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nipekari.pbworks.com/f/rumak.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/77858155535.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144427650/1432047970.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144645759/psychoanalytic_theory_of_personality.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/f/61453800632.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/sony_cyber_shot_hx400v_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5aebe0c-1046-4245-bb38-9d7f62c6b4ea/windows_activation_key_for_windows_7_ultimate_32_bit_free_download.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144483570/wawelovonaruvepezinokowor.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/13564880514.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/w/file/fetch/144546474/kujudetibarepoxopikebumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ae2eac-b485-41f2-bae5-40d9ff064b2c/99240309952.pdfIn PDF document text
    • http://zilujilixeti.pbworks.com/f/32051913501.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_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 5300 bytes
SHA-256: 2e09a2355ad5c4241548ea3d0a75a17736c4af338dd3740135e30d57c4b3324c
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 10204 bytes
SHA-256: 95051467a9b8d032b5ae5c2a489c8bdb750bde3672514d439ab18c42f8437a58

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