Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9a5fd4518ff5c2…

MALICIOUS

PDF

77.2 KB Created: 2020-12-15 04:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fdef303dd11f79ce82187711a3393ac1 SHA-1: 568d87dfc88008a63ef93600a6f2af94e5df8c85 SHA-256: 5a9a5fd4518ff5c292effb5c7831ea404c265230894787905638524889f6664b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one URL is confirmed to be malicious redirector infrastructure. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=dave+ramsey+complete+guide+to+money+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_5fb2afd50351c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f88c19e37a0f.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/6440375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fcaa8a0c2d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5fba0a1854d4a.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/74808175b3e3.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/dekepata_veribuni_karafuw.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4fc57c-a8d8-4c29-bbbe-72038be6f0c0/the_imaginarium_of_doctor_parnassus_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e3e092-4b6f-4c40-bb1f-3c58698d93ae/vipagewaxefolaxebilinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af4b5fc-3d5f-4d33-a297-e2592ad282e7/4096201634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365ce0a8-25a7-49d1-8cf1-3b3f4c76edd9/juwepavunupapumalipi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77f60d743eb434449881c/t/5fc935021024e311546ab6cb/1607021826665/nvs_9th_class_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f66c5d-25c2-4161-b784-060515cf1177/gudutupizevugifasaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd26e6fbb67f096305560a/1606231785313/worksheet_5-59_genetics_matching_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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5636 bytes
SHA-256: 805b5b7c62def521ac5188820619536e1fb5650ddd53c1293aa98772078a1042
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10680 bytes
SHA-256: 71eb06b653912f02b301bd9fb79d3ba6ecc465ad0efec67b0b45de9f57aad007