Malicious PDF — malware analysis report

Static analysis result for SHA-256 97af17d0372767ce…

MALICIOUS

PDF

89.1 KB Created: 2021-06-06 23:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c8aaf84cfd96115dccffe4a62f7fdc0 SHA-1: cc5e0e2d32a30aceffb5e46942bda9507cd09948 SHA-256: 97af17d0372767ce6e498b8a04789b4b012eda855e81ce51c08945be2d1e06cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://nipisod.ru/123?utm_term=baku+mutu+alkalinitas+pdf PDF link annotation
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/nidusitikeguzit.pdfIn PDF document text
    • https://fuwivofopotafuj.weebly.com/uploads/1/3/5/3/135388640/97d9f233ce07203.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/kozogefewolukodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_606b0b163b477.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/gulek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_603c2c1b83b6c.pdfIn PDF document text
    • https://fofosaja.weebly.com/uploads/1/3/4/2/134234592/6c38c431a5f331f.pdfIn PDF document text
    • https://letenotej.weebly.com/uploads/1/3/4/5/134595585/kaxelesudiximo.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/8154011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_5fe6c5403109f.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/dcad306a4d24b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_600315bf2ef3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446161/normal_6007bca412463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_6026e9a216f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455681/normal_6041b3672d200.pdfIn PDF document text
    • https://rejafolurolege.weebly.com/uploads/1/3/0/7/130740622/b8ca1261.pdfIn PDF document text
    • https://gigorevexi.weebly.com/uploads/1/3/4/7/134714530/6ed8261.pdfIn PDF document text
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/8522982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vixifalino.pbworks.com/f/convert_scanned_images_to_online.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144505911/fizobuvajesesadofulijuv.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/vujajedavovajiporudume.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/w/file/fetch/144723696/937903366.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_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 5204 bytes
SHA-256: 7ae88bbfa213115041dbc132340555ba720f65f144cde8e1c4ea16e2a5cb2ac3
font_01_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 10600 bytes
SHA-256: e8d12730fc4c7c5edbe240d739f610a17888e79150980b7176768dc6e8a34a32