Malicious PDF — malware analysis report

Static analysis result for SHA-256 515f38ffd6ee8f75…

MALICIOUS

PDF

67.5 KB Created: 2020-12-26 15:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba2d660bfcfd51bb61229f4c20c97c7c SHA-1: 2a7f4433efd2f1e31ffa0b1b8a48379855b13ae6 SHA-256: 515f38ffd6ee8f7538d50a7add634ecd758fe63499983222599379b1dae1b9fb
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large collection of external PDF links, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier and ClamAV detection strongly support a malicious classification.

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://traffine.ru/123?utm_term=polygons+in+the+coordinate+plane+worksheet+6th+grade+pdf In PDF document text
    • https://cdn.sqhk.co/fejavegiwo/gcAjhif/49960933819.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/e64f90e5.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/bolepiwosojetiloveja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_5fb8324590bb6.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/milegedik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fc7d6227d3f9.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://uploads.strikinglycdn.com/files/ee699192-c7e7-4c59-8ea9-bd472ddb1675/indivisible_iron_kingdom_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a004c6d3-34f6-48ec-851d-3410de47dab3/xavoxijerugebuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70c9a38-f494-44e2-95cd-0831e6893c8e/blender_assign_bone_to_vertex_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206a0ac6-67e2-457f-b103-a72de10a5be2/dragon_ball_z_infinite_world_special_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69afc548-8af4-450c-bbb1-10795649ef3e/93818264014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bff82e2-cae3-4b33-ae36-74ee27b1205f/golden_gate_cloning_troubleshooting.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_off0000bd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 5620 bytes
SHA-256: 0f54c73fb6ac74816fdca03f69a3b841e1ec22f3c9e05f11dd5f7868396eba44
font_01_sfnt_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 9952 bytes
SHA-256: 117c294e5a4ff73b8382a9fc19e771a68e979e0ff7b35d06b7996bf5e1b2cd9b
font_02_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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