Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa375bed482a41c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 12:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c0e5c7f4b40c4f6837720440c18707fd SHA-1: 22a32c981cac081e526619a27ed57e3c0d894616 SHA-256: afa375bed482a41c1bacce2425a5e9cded992d5866e42997a7a565a43f2e0aa9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/award?keyword=bmw+320i+e90+owners+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366313/normal_60115df0aaec4.pdfIn PDF document text
    • https://faneputivodi.weebly.com/uploads/1/3/0/8/130874667/sijuf.pdfIn PDF document text
    • http://uabiomanix.xyz/what_side_of_the_road_do_you_drive_on_in_japanfjuk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_603fc9df6e188.pdfIn PDF document text
    • http://molotkov.site/20663775975rddj1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_6029eedae0dac.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/data_structures_and_algorithms_in_python_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_5fe7fb2daeca3.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/gesogogesuf-ganawemipewamop.pdfIn PDF document text
    • http://fallofelin.online/725821224zj48f.pdfIn PDF document text
    • https://wugabatove.weebly.com/uploads/1/3/5/3/135318753/4860493.pdfIn PDF document text
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/ranaxevusimi-zibapanurije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodegifu.atwebpages.com/53666950695.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_b384fe09bbde4600b1848611b5989836.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_58bf0c8f526549fa8700074066ebb45c.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_abde150f5fa04e838dc21c1a6cfaa936.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_18040ecf898847f6ae518d11f7be4819.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_5f3a1eb0ddf2476bb5f30a718f871821.pdf?index=trueIn PDF document text
    • http://zogosugo.onlinewebshop.net/95884234675.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_7742f9e3e8b84188aab4052ca2f7a6df.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_834db916840043fab409a3eea4411c38.pdf?index=trueIn PDF document text
    • http://gitodake.myartsonline.com/enriques_journey_audiobook_chapter_5.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_5def20931e164d328a972efb2671b2f3.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_fe227e48aab4412c9fdbbdd4f603eb53.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5920 bytes
SHA-256: 23407d564b5873ec8791b603b08369938b580120722fdf3145b978a0882f32aa
font_01_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10884 bytes
SHA-256: 1f5cf007b07f3ba8d2ddc6fb2dee4acd9a68fe00704ab9f81fd99eebda8bbb90