Malicious PDF — malware analysis report

Static analysis result for SHA-256 8334133bdee85b68…

MALICIOUS

PDF

80.1 KB Created: 2021-04-03 15:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7d6cbf15a31528d974b98145f49a0251 SHA-1: 6a413fb5af470e0d5d8e37f57f89cdb39bb9a0fe SHA-256: 8334133bdee85b68ee092a68ba257f23dddb404982d0290e311853f9a42ce198
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 hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=information+system+in+banking+sector+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fca782936ee2.pdfIn PDF document text
    • https://zobigitesi.weebly.com/uploads/1/3/4/6/134691723/3185461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_604586e44ae4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5ff9ab7cc22b0.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/rabixopu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5feff2246fa1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5fff533c946a2.pdfIn PDF document text
    • http://momivegod.22web.org/free_printable_comprehension_worksheets_grade_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_6011e11760cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_6011c02073721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_600c651522958.pdfIn PDF document text
    • https://gupuvuzuguzi.weebly.com/uploads/1/3/1/3/131379578/puvidovigipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6045bfde0aad5.pdfIn PDF document text
    • https://walupufodurutos.weebly.com/uploads/1/3/4/7/134734499/nidamusefosepem_wosofezifex_bimuluvif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_b3b1b99e9baf4de29d16c720800f31e0.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_a950349ece9c49feb4db5f7f295a9f71.pdf?index=trueIn PDF document text
    • http://mavikigozemibe.epizy.com/what_factors_influence_our_behavior.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/guided_imagery_script_for_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/bakflip_f1_installation_manual.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_712f35aaaf5c4475be0f7c63253a785f.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_4057038d1419470f886890c3b4d2af29.pdf?index=trueIn PDF document text
    • http://kexibuxufo.epizy.com/browning_a500r_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 5476 bytes
SHA-256: 92d5b7758c25a878824aab07e107cdd934bb9bc6fb818d6c4d1fed08454fc49c
font_01_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 11048 bytes
SHA-256: 4ff486f23fbaf617506a2ae72abae029ea40b4744ec08a73fbc25307d2402aa3
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f