Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fb4da034a6f9e7…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 23:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4d7012eaa6e44c4f0f256bc121d497a3 SHA-1: aa368d1d8443c4f27a6fae433890cc1961b9187e SHA-256: c5fb4da034a6f9e7138e436dc139b4fbac0bbee102c329b4d95a20f72463644f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://vilenefex.ru/wix?keyword=medical+office+procedures+manual, appears to be a lure for potentially malicious content or phishing.

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://vilenefex.ru/wix?keyword=medical+office+procedures+manual PDF link annotation
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/pipaditega_lotirukib_pujakoruma.pdfIn PDF document text
    • https://nikotegonekis.weebly.com/uploads/1/3/4/6/134628666/katuze-bisizixi.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/33032981698.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/jiMgehi/bomebitumuwixugumagetile.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/adobe_converter_download_for_windows_8.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/2463450.pdfIn PDF document text
    • https://vorusetovol.weebly.com/uploads/1/3/4/6/134611907/7f986.pdfIn PDF document text
    • https://muwewemumefiga.weebly.com/uploads/1/3/0/8/130874681/f31626.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/13873b6bfdd0d2.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/gexagiriziga.pdfIn PDF document text
    • https://durezeneb.weebly.com/uploads/1/3/4/2/134235042/bowuvofapakigowesasa.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/lshiGia/midimanagebasat.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/ck5Qxjd/76388780562.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/paritufej.pdfIn PDF document text
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/7db0e7f2b.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/calendar_2020_malaysia_template.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/bilup.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/UduzTfk/wonejuzorugovu.pdfIn PDF document text
    • https://zapilututok.weebly.com/uploads/1/3/4/3/134341349/zusegexeso-degukawijuxuvu-zazobef-favere.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/04ccffd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/my_favorite_animal_dog_essay_in_english_for_class_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e72a6c5-d0da-4910-850e-fe219b9ab6c8/zujakipowikeluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b451a9b-0dd4-46a2-b1d3-b1ec390efa05/macbeth_act_1_scene_2_script.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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 5304 bytes
SHA-256: 1f3b0f71b988dac855c93a74a44e332fed5fc5626778695b20596e19ec80c38e
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 9844 bytes
SHA-256: dce227a799359659ca2eab47d746326e24b9e11e8176c3c4e31d9febb7d029be