Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb79a9f82efa38a…

MALICIOUS

PDF

84.0 KB Created: 2021-04-01 01:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a4156294c60a4c51620c7ec1a3c0329f SHA-1: 3fe6fa0a976a2efec18515048a9f9ba6257a150d SHA-256: ecb79a9f82efa38aa3f6d4f402334e989310de629345d6b1202d8e3d65e29449
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the presence of PDF_SEO_LINK_FARM heuristics indicate an attempt to direct users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/aws?utm_term=is+planet+fitness+app+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368478/normal_605caf8e7d867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_6053c1bec7173.pdfIn PDF document text
    • http://penageli.getenjoyment.net/83902842024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fc7c48ccbe61.pdfIn PDF document text
    • http://vesajob.getenjoyment.net/livro_compreender_o_behaviorismo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_60579adc2d9c9.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/cement_plant_flow_chart.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/bhartiya_samvidhan_in_marathi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_552a7ff8007e45b692366134e9151517.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_6c6951fab3d24873804f0acbcb32918b.pdf?index=trueIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_4d5e268b4f854e4480fdc22734fbeb83.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_a7c292ff0152451886e5c7a18b23a440.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_fee0688e6c53433faa31d1eac10ec601.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_a3f2406e02f3462daa6a7ac06156955d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30ef2d0-219e-4f35-bdac-e49afbc4ed47/virikupoja.pdfIn PDF document text
    • http://jazopizebe.atwebpages.com/aashto_m_170_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44322f79-2877-4b6e-88a6-9436b1eae4d4/nowepareberesakofizalotu.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_58cc6cddda5f4f99af97432c8a73a872.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8de8b51-b4ed-4966-ae16-9132825470f8/gemaguzufijidojipikit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd76feb-c07c-4976-8dda-3b90711a42d9/willy_wonka_and_the_chocolate_factory_movie_quotes.pdfIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_ce127267dfc347a6973d9e33f0d95843.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_d1d5da9df34e42ac8813c2a980c13426.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_a53054eed68241cb83a8f3d856858ad4.pdf?index=trueIn 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_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 4832 bytes
SHA-256: 012ec2e7926017333252514971a3437828b3dbb44ee7a0c46353a35662fe4927
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 11552 bytes
SHA-256: e970979b72d554206357846ca9e308e3719dddab52afbd22cf0d75ea358894ca