Malicious PDF — malware analysis report

Static analysis result for SHA-256 0329138e918bbbe9…

MALICIOUS

PDF

82.6 KB Created: 2021-05-25 01:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fdbd658f0b46062a65551cead9ee28f9 SHA-1: 92c31bbb29d9fb6c8e9ce9296eb305e8a27b2489 SHA-256: 0329138e918bbbe940a803c0cfcfddbc08a6119926ede3f83ce313ebffdd9ad9
126 Risk Score

Malware Insights

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

The PDF document was identified as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. One of the primary URLs extracted is https://druttle.ru/strik?utm_term=sosyolojide+temel+fikirler+%25C3%25B6zet, which appears to be a redirector. The document's structure and embedded links suggest it is designed to manipulate search engine results or lead users to potentially harmful content, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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/strik?utm_term=sosyolojide+temel+fikirler+%25C3%25B6zet PDF link annotation
    • https://fojuxiwo.weebly.com/uploads/1/3/2/6/132695505/9231072.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/7683963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_605a64849cfad.pdfIn PDF document text
    • https://gebomatera.weebly.com/uploads/1/3/5/3/135396668/2a1eaf96df3c.pdfIn PDF document text
    • https://punerumoluzes.weebly.com/uploads/1/3/4/8/134897399/bojozawam_widuzufu.pdfIn PDF document text
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/5791828.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/8770453.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/2722455.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/3672254.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/2859c9698e8.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/9a3a66.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/dadadomejutovaw.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/1418170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_6050d1470e52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_60476ee3983e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_6065f0cc99700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3151cd6f-83f2-4b6c-b18f-3db8111173bb/casio_alarm_chrono_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c61f86f-40f6-4894-a1b0-3f59ce6c88eb/35663611436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a8735f-7b38-488f-bf4f-c701b46286b2/37994983009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527ac5ff-c928-4b0f-bdc6-6534638676e9/lekijovon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ac4e0a-422a-4151-b63d-6a6af9d4d959/7702143875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5e4b38-2739-464d-a079-c00cae3ef65c/ejemplo_de_curriculum_vitae_para_primer_trabajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6ffde3-31a9-47ce-b96e-18f7a2b34d9f/harbor_breeze_centerville_ceiling_fan_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9549955-7516-4e98-8efa-4cffc34651fd/pekem.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_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 5376 bytes
SHA-256: 526c37f3a1b87273b292a5b225ab1e89973c64c8598cbf3c49e74d005cf4b311
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 11568 bytes
SHA-256: 305fafecfd073e3291806f1b3de50b3fb65ade9f3a721066dd94158edf15ca6b