Malicious PDF — malware analysis report

Static analysis result for SHA-256 e795e9eaf2af74d1…

MALICIOUS

PDF

76.5 KB Created: 2021-05-31 22:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7dceb8ed3d77f34ba1f6f83afc027085 SHA-1: 1af3c62ab03108f11b195030cd1ccc02ac66e69a SHA-256: e795e9eaf2af74d1004f6b812daaad95dcdd04a663c8501545e174419447df9d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/pbw?utm_term=burglar+alarm+project+report+pdf PDF link annotation
    • https://gobazivow.weebly.com/uploads/1/3/1/0/131070387/faxobikalek.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/jibufeb.pdfIn PDF document text
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/ec050f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_60277795e8ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60620c782d46c.pdfIn PDF document text
    • https://fixalurona.weebly.com/uploads/1/3/4/3/134314544/5c1bd.pdfIn PDF document text
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/e0ecb286ceed456.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/favesakiwu_fekivubone.pdfIn PDF document text
    • https://wusoditada.weebly.com/uploads/1/3/1/4/131406121/zerevunefuvigik_geminebefid_toxinib_foxolev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunaruribeg.pbworks.com/f/how_to_activate_g-shift_g502.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/w/file/fetch/144425616/zejixifikixikofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a21843-72dc-4ba6-bb11-6be8f2f359d0/41288119021.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/what_is_classroom_control.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/jemexew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fc863e-29be-452a-92f1-dacb54da3033/59467475904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed97c1d7-447e-4fd5-9c2c-734125d4fcdb/junji_ito_manga_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a888ce9-33e8-43b4-b450-2248652bc519/4852778793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059edfe1-4f46-45a2-9ecd-4aebd80c7df8/how_to_start_hayward_gas_pool_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cbec10-a081-4acd-8988-547b17b84b6a/what_order_to_read_the_amory_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94409d4-ecd8-4020-ae92-2c340bb9883e/oster_instant_steamer_directions.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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 5424 bytes
SHA-256: c1fbee1a2b717c3c952504efdb12e1b89fad88cf620fbd82abfb9ce32025e3ef
font_01_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 10700 bytes
SHA-256: 8229e02ea30026c469781c1fe9193dc076a463a2976afa679dcbed0277ab941a