Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7291c79b8510670…

MALICIOUS

PDF

92.2 KB Created: 2021-06-09 11:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ff310007b698b7fad19a4ab21dc92239 SHA-1: d7f09551dcbca17436790526e56b270ee7765157 SHA-256: d7291c79b8510670c0920c5c66ebc174eb70cd220912d80fae91c1cb0de2f7f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with the primary external URI pointing to a URL containing 'utm_term' parameters, suggesting a phishing or malicious redirection attempt. No scripts were extracted, but the presence of numerous URLs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://archism.ru/pbw?utm_term=nepali+meri+bassai+2019 PDF link annotation
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/5942665.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/nawamafumomek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5feee4a9bce1d.pdfIn PDF document text
    • https://wevozunivutuk.weebly.com/uploads/1/3/1/4/131484467/sivibokowuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6026f6bb76a4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60139d2b22649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_606e3ffe40545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144419436/35090846562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8b05ee-ff36-4ce9-ab5a-338841706f7c/ratajunuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22514f9a-e743-42ae-b8bd-4a584a825efe/17726371679.pdfIn PDF document text
    • http://fupimogevif.pbworks.com/w/file/fetch/144837600/74122668497.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144624324/kifuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4389575-4a25-4f35-beef-8da0dd20c8ce/air_force_1_white_and_black_size_5.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/ferdinando_el_toro_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6a77ed-9d92-4c63-8ec2-a31b7e0f001b/sex_offenders_california_laws.pdfIn PDF document text
    • http://juzifezazuk.pbworks.com/w/file/fetch/144922182/tukuxulebomun.pdfIn PDF document text
    • http://morabef.pbworks.com/f/60887923274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac01593-a64a-471c-b895-3f61c974f895/which_is_the_best_python_course_on_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e76100-952b-4163-a6ab-3a9fb2260c7c/tenuwir.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 7236 bytes
SHA-256: 7ce93c2acb2c65b4578bf7398613f14920e34fbc82bce3751efab3f7e57c317e
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 5556 bytes
SHA-256: e1bdfabddda9ca02a2e90afae150c776eed260012d287db881dbf77999c30ded
font_02_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 2408 bytes
SHA-256: 8300b2786dadbeac13e31032f5f50a87935056e5ba8a4be402c7d7764860bbd0
font_03_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 11444 bytes
SHA-256: e65c799e6a7cf7e4fa351a0f9f8b84d267a92b5e8fa38635675555f81647180b
font_04_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_05_sfnt_off00014c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C03 6392 bytes
SHA-256: 9279bfcd8ca026297f8f81286cf0cebc446ba904394579e8de20abec3ddd7b74

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