Malicious PDF — malware analysis report

Static analysis result for SHA-256 24540ec41bd5e7e5…

MALICIOUS

PDF

42.2 KB Created: 2020-10-25 13:20:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e8e2669e8b9ca03b7a62790fcb490a58 SHA-1: 1de5c50aa5e24e0d3693529d5ca588853054fda2 SHA-256: 24540ec41bd5e7e5cc323dbb58128051b9ea8148a0d0e20daf94d053a5257fda
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one link directs to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the link farm behavior is a common tactic for initial distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://cctraff.ru/wb?keyword=denso%20injector%20repair%20pdf In PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/dcefeca.pdfIn PDF document text
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/8bb6a337db1.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/06f16dc13a18.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/6764384.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/1395216.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/fac7baa9.pdfIn PDF document text
    • https://puvugaluruwibok.weebly.com/uploads/1/3/4/4/134445294/80cb18511a81cf7.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/3f3f79fd58d.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/a89fe602-324e-4090-96c5-d73d0b65d41a/69660181326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b98989-034a-4221-a437-cb12139a8c35/89589829965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca90839-a145-4a7b-9038-170f6217ea8f/koxubiweju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59588a5b-b8cc-448a-8d39-5eebce16d765/zemolevigeviri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e82741-b90b-470f-a3a4-8e278e2d3cf1/39966680266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90720c19-ebb4-4818-a959-bdf93bca825f/9077580283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e64e8a1-d386-4ac5-882b-956405fa7eff/xaxubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c78a86-2aa8-448c-9fca-bf41d573af48/32622316683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa20f4b2-9429-4ac2-bcba-35850bfc91ad/71271628784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930ed4f8-95d5-40f8-8d32-9bb42b412a17/99371492282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29387b85-800f-4731-ba4e-f1e5ab97c51a/memenavobaxizekakex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abed045c-d58f-49ec-844e-bb478fa51354/wawaxofuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf6a44f-d3d3-43b4-aeb2-f477a1801f75/romawemumavudupefogatejum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bce0f8f-5fde-4572-badd-8424b6e55f66/45965449962.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_off00006551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6551 5192 bytes
SHA-256: 0f977e0ecb02f1ce1bb203f15b3a5200df4c21f28ed9adab6bdae501eb356586
font_01_sfnt_off0000770c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 10804 bytes
SHA-256: a89bed3b1aa188c8ed38a3f642579db333424d2f7b1fab8f39e3fec5de30eeae